#include <iostream>
#include <cmath>
using namespace std;

int main()
{
    int a, b;
    cin >> a >> b;

    if(a == 0){
        if(b == 0){
            cout << "INF" << endl;
        } else {
            cout << "No solution!" << endl;
        }
    } else {
        cout << "x = " << - b / a << endl;
    }

    int n;
    cin >> n;

    int i = 1;
    int f = 1;

    if(i <= n){
        f *= i;
        i++;
    } else {
        cout << f << endl;
    }

    int a, b;
    cin >> a >> b;

    if(a == 0 || b == 0){
        cout << "Error" << endl;
    } else {
        if(a == b){
            cout << a << endl;
        } else {
            if(a > b){
                cout << a = a - b;
            } else {
                cout << b = b - a;
            }
        }
    }

    int quotient, remainder, a, b;

    cout << "Enter divisor: " << endl;
    cin >> a;

    cout << "Enter dividend: " << endl;
    cin >> b;

    quotinet = a / b;
    remainder = a % b;


    cout << "Quotient: " << quotient << endl;
    cout << "Remaineder: " << remainder << endl;


    cout << "The size of int: " << sizeof(int) << endl;
    cout << "The size of double: " << sizeof(double) << endl;
    cout << "The size of bool: " << sizeof(bool) << endl;
    cout << "The size of char: " << sizeof(char) << endl;
    cout << "The size of long: " << sizeof(long) << endl;
    cout << "The size of short: " << sizeof(short) << endl;
    cout << "The size of long double: " << sizeof(long double) << endl;

    // swapping numbers

    int num1, num2;
    cin >> num1 >> num2;

    cout << "Before swapping numbers: " << endl;
    cout << "First number = " << num1 << "\n" << "Second number = " << num2 << endl;

    int temp = num1;
    num1 = num2;
    num2 = temp;

    cout << "After swapping numbers: " << endl;
    cout << "First number = " << num1 << "\n" << "Second number = " << num2 << endl;

    // even or odd number

    int n;
    cin >> n;

    if(n % 2 == 0){
        cout << "Even number! " << endl;
    } else if(n % 2 != 0) {
        cout << "Odd number! "
    }

    // check whether character is a consonant or vowel

    char symbol;
    cin >> symbol;

    if(symbol == 'a' || symbol == 'e' || symbol == 'i' || symbol == 'u' || symbol == 'o' || symbol == 'A' || symbol == 'E' || symbol == 'I' || symbol == 'O' || symbol == 'U'){
        cout << "Character is a vowel" << endl;
    } else {
        cout << "Character is a consonant " << endl;
    }

    // roots of quadratic equations

    int a, b, c, D;
    cin >> a >> b >> c;

    D = b * b - 4 * a * c;

    if(D > 0){
        cout << "x1 = " << ((- b - sqrt(D)) / 2 * a);
        cout << "x2 = " << ((- b + sqrt(D)) / 2 * a);
    } else if(D == 0){
        cout << "x1 = x2 = " << - b / (2 * a) << endl;
    } else {
        cout << "x1 = " << - b / (2 * a) << endl;
    }

    int a, b, c;
    cin >> a >> b >> c;

    if(a > b && a > c){
        cout << "Largest number is: " << a << endl;
    } else if(b > a && b > c){
        cout << "Largest number is: " << b << endl;
    } else {
        cout << "Largest number is: " << c << endl;
    }

    // check whether the year is Leap

    int year;
    cin >> year;

    bool isLeap = (year % 4 == 0 && year % 100 != 0) || (year % 400 == 0);

    cout << boolalpha << isLeap << endl;

    // bad things about FMI

    cout << "Velikova nqma da me skusa! " << endl;
    cout << "Bojilov ne e religiq" << endl;
    cout << "Algebrata ne proshtava!" << endl;

    // tip point

    int x, y, x1, y1, radius;
    cin >> x >> y >> c1 >> c2 >> radius;

    bool doesBelong = sqrt(x - x1) * (x - x1) + (y - y1) * (y - y1) <= radius * radius;

    cout << boolalpha << doesBelong << endl;

    // existing triangle

    double a, b, c;
    cin >> a >> b >> c;

    bool isProperTriangle = (a + b > c || a + c > b || b + c > a);
    int halfPerimeter = (a + b + c) / 2;
    double area = (sqrt(halfPerimeter(halfPerimeter - a) * (halfPerimeter - b) * (halfPerimeter - c)));
    double perimeter = a + b + c;

    cout << boolalpha << isProperTriangle << endl;
    cout << area << endl;
    cout << perimeter << endl;

    // determine sum, difference, product and division

    int a, b;
    cin >> a >> b;

    cout << "Sum of two numbers is: " << a + b << endl;
    cout << "Difference of two numbers is: " << a - b << endl;
    cout << "Multiplication of two numbers is: " << a * b << endl;
    cout << "Division of two numbers is: " << a / b << endl;

    // print all the digits of one numbers

    int n, sum = 0;
    cout << "Enter a 4-digit number: " << endl;
    cin >> n;

    int firstdigit = n / 1000;
    int seconddigit = (n / 100) % 10;
    int thirddigit = (n / 10) % 10;
    int forthdigit = n % 10;

    cout << "First digit: " << firstdigit << endl;
    cout << "Second digit: " << seconddigit << endl;
    cout << "Third digit: " << thirddigit << endl;
    cout << "Forth digit: " << forthdigit << endl;

    sum = firstdigit + seconddigit + thirddigit + forthdigit;

    cout << "The sum of digits: " << sum << endl;

    int reverse;

    reverse = (forthdigit * 1000) + (thirddigit * 100) + (seconddigit * 10) + firstdigit;

    cout << "Reverse number of original number is: " << reverse << endl;

    int a,b;
    cout << "Enter two numbers: " << endl;
    cin >> a >> b;

    int product = a * b;

    cout << product << endl;
    cout << "LastDigit: " << product % 10 << endl;
    cout << "Even or Odd? " << ((product % 10) % 2 == 0) << endl;


    int a, b;
    cin >> a >> b;

    cout << "Before Swapping: " << endl;
    cout << "First: " << a << "\n" << "Second: " << b << endl;

    a = a + b;
    b = a - b;
    a = a - b;

    // there is a second way

    int temp = a;
    a = b;
    b = temp;

    cout << "After swapping: " << endl;
    cout << "First: " << a << "\n" << "Second: " << b << endl;


    // divisor to other one

    int a, b;
    cout << "Enter two numbers: " << endl;
    cin >> a >> b;

    bool isDivisor = (a % b == 0);

    cout << boolalpha << "num1 = " << a << " and " << "num2 = " << b << " => " << isDivisor << endl;


    double a, b, c;
    cin >> a >> b >> c;

    bool isProperTriangle = (a + b > c && a + c > b && b + c > a);

    cout << boolalpha << isProperTriangle << endl;

    // determine max and min between three numbers

    double a, b, c;
    cin >> a >> b >> c;

    double max = a;
    double min = a;

    if(b > max){
        max = b;
    }
    if(c > max){
        max = c;
    }
    if(b < min){
        min = b;
    }
    if(c < min){
        min = c;
    }

    cout << "MAX: " << max << endl;
    cout << "MIN: " << min << endl;

    // determine if the number belong to interval

    int startInterval, endInterval;
    int x;
    cin >> x;
    cin >> startInterval >> endInterval;

    bool isInInterval = (x >= startInterval && x <= endInterval);

    cout << boolalpha << isInInterval << endl;


    // check if year is Leap

    int year;
    cin >> year;

    bool isLeap = (year % 4 == 0 && year % 100 != 0) || (year % 400 == 0);

    cout << boolalpha << isLeap << endl;


    // building a calculator

    int num1, num2;
    char choice;

    cout << "Enter first number: " << endl;
    cin >> num1;

    cout << "Enter second number: " << endl;
    cin >> num2;

    cout << "Enter a choice: " << endl;
    cin >> choice;

    switch(choice){
    case '+':
        cout << num1 << " + " << num2 << " = " << num1 + num2;
        break;
    case '-':
        cout << num1 << " - " << num2 << " = " << num1 - num2;
        break;
    case '*':
        cout << num1 << " * " << num2 << " = " << num1 * num2;
        break;
    case '/':
        if(num2 != 0){
            cout << num1 << " / " << num2 << " = " << num1 / num2;
        } else {
            break;
        }
    default:
        cout << "Invalid choice!" << endl;
        break;
    }


    char character;

    if(character >= 'a' && character <= 'z'){
        cout << "The lower case is corresponding to... " << (char) - 32;
    } else if(characer >= 'A' && character <= 'Z'){
        cout << "The upper case is correspoding to... " << (char) + 32;
    } else {
        cout << "Is not a letter!" << endl;
    }

    char character;
    cin >> character;

    if(character >= '0' && character <= '9'){
        cout << "it's a digit!" << endl;
    } else if(character >= 'a' && character <= 'z'){
        cout << "It's lowercase! " << endl;
    } else if(character >= 'A' && character <= 'Z'){
        cout << "It's uppercase! " << endl;
    } else {
        cout << "Is a special symbol! " << endl;
    }

    int month;
    cin >> month;

    switch(month){
    case 12:
    case 1:
    case 2:
        cout << "Winter " << endl;
        break;
    case 3:
    case 4:
    case 5:
        cout << "Spring" << endl;
        break;
    case 6:
    case 7:
    case 8:
        cout << "Summer " << endl;
        break;
    case 9:
    case 10:
    case 11:
        cout << "Autumn " << endl;
        break;
    default:
        cout << "Invalid month! " << endl;
        break;
    }


    int year, month;

    cout << "Enter year: " << endl;
    cin >> year;

    cout << "Enter month: " << endl;
    cin >> month;

    bool isLeap = (year % 4 == 0 && year % 100 != 0) || (year % 400 == 0);

    switch(month){
    case 1:
    case 3:
    case 5:
    case 7:
    case 8:
    case 10:
    case 12:
        cout << 31 << endl;
        break;
    case 4:
    case 6:
    case 9:
    case 11:
        cout << 30 << endl;
        break;
    case 2:
        cout << isLeap + 28 << endl;
        break;
    default:
        cout << "Invalid month " << endl;
        break;
    }

    int n;
    cout << "Enter a 4-digit number: " << endl;
    cin >> n;

    if(n < 999 && n > 10000){
        cout << "You'll get the error!" << endl;
    } else {
        int firstdigit = n / 1000;
        int seconddigit = (n / 100) % 10;
        int thirddigit = (n / 10) % 10;
        int forthdigit = n % 10;

        int max = firstdigit;

        if(seconddigit > max){
            max = seconddigit;
        } else if(thirddigit > max){
            max = thirddigit;
        } else if(forthdigit > max){
            max = forthdigit;
        }

        cout << "Is the first digit even or odd? " << (firstdigit % 2 == 0)
             << "Is the first digit the biggest? " << (firstdigit == max) << endl;
    }

    int tomato, patoto, pepper, carrot, olive, flavours;
    bool hasFriend;

    cout << "Tomato: " << endl;
    cin >> tomato;
    cout << "Patoto: " << endl;
    cin >> patoto;
    cout  << "Pepper: " << endl;
    cin >> pepper;
    cout << "Carrot: " << endl;
    cin >> carrot;
    cout << "Olive: " << endl;
    cin >> olive;
    cout << "Flavours: " << endl;
    cin >> flavours;
    cout << "Is there a friend? " << endl;
    cin >> hasFriend;

    bool studentSalad = (tomato <= '1' || patoto <= '2' || pepper <= '4' || carrot <= '3' || olive <= '3' || flavours <= '150');
    bool studentSoup = (tomato <= '2' || patoto <= '3' || pepper <= '5' || carrot <= '6' || olive <= '10' || flavours <= '200');
    bool studentGuvech = (tomato <= '5' || patoto <= '6' || pepper <= '12' || carrot <= '7' || olive <= '12' || flavours <= '300');

    bool isGoingToBeFeed = studentSalad || ((studentSoup || studentGuvech) && hasFriend);
    cout << (isGoingToBeFeed ? "Yes" : "No") << endl;


    return 0;

}