// HomeWork_w4.cpp
//

#include <iostream>

using namespace std;
void luckyNum()
{
    int luckyNum;
    cout << "Enter a six value number \n";
    cin >> luckyNum;
    if (luckyNum < 100000)
    {
        cout << "Please,read carefully, enter a six value number \n";
        cin >> luckyNum;
    }
    if (
        ((int)luckyNum / 100000) + ((int)(luckyNum % 100000) / 10000) + ((int)(luckyNum % 10000) / 1000) == ((int)(luckyNum % 1000) / 100) + ((int)(luckyNum % 100) / 10) + ((int)luckyNum % 10))
         {
        cout << "HAPPY number" << "\n";
    }
    else {
        cout << "UNHAPPY number" << "\n";
    }

}

void fourDigitNumber()
{
    int number,
        num1,
        num2,
        num3,
        num4;
    cout << "Enter a four-digit number \n";
    cin >> number;
    if (number < 1000)
    {
        cout << "Error, try again later \n";
    }
    else
    {
        num1 = number / 1000 + 1;
        num2 = (number % 1000) / 100 + 1;
        num3 = (number % 100) / 10 + 1;
        num4 = (number % 10) + 1;
        cout << num1 << num2 << num3 << num4 << "\n";
    }


}

void max()
{
    int num, max = 0;
    cout << "Enter seven integers \n";
    for (int i = 0; i < 7; i++)
    {
        cout << i + 1 << " number - ";
        cin >> num;
        if (num > max)
        {
            max = num;
        }
    }
    cout << "Max is " << max;
}

void gasoline()
{
    int distanceFrom_A_to_B,
        distanceFrom_B_to_C,
        cargoWeight,
        mileage,
        max_flight,
        max_capacity = 300;

    cout << "Please enter cargo weight \n";
    cin >> cargoWeight;
    if (cargoWeight >= 0 && cargoWeight <= 500)
    {
        mileage = 1;
        max_flight = max_capacity / mileage;
    }
    if (cargoWeight >= 501 && cargoWeight <= 1000)
    {
        mileage = 4;
        max_flight = max_capacity / mileage;
    }
    if (cargoWeight >= 1001 && cargoWeight <= 1500)
    {
        mileage = 7;
        max_flight = max_capacity / mileage;
    }
    if (cargoWeight >= 1501 && cargoWeight <= 2000)
    {
        mileage = 9;
        max_flight = max_capacity / mileage;
    }
    if (cargoWeight > 2000)
    {
        cout << "It's too heavy bro \n";
        return;
    }
    cout << "Please enter distance from A to B \n";
    cin >> distanceFrom_A_to_B;
    if (max_flight <= distanceFrom_A_to_B)
    {
        cout << "You cannot fly, don't enough fuel\n";
        return;
    }
    else
    {
        distanceFrom_A_to_B = max_flight - distanceFrom_A_to_B;
    }
    cout << "Please enter distance from B to C \n";
    cin >> distanceFrom_B_to_C;
    if (max_flight <= distanceFrom_B_to_C)
    {
        cout << "You cannot fly, don't enough fuel\n";
        return;
    }
    if (distanceFrom_B_to_C > distanceFrom_A_to_B)
    {
        distanceFrom_B_to_C = (distanceFrom_B_to_C - distanceFrom_A_to_B) * mileage;
        cout << "You need to add  " << distanceFrom_B_to_C << " fuel\n";

    }
    else
    {
        cout << "it's not need to add fuel\n";
    }
}


int main()
{
    //Task_1: Lucky number
    luckyNum();
    //Task_2:
    fourDigitNumber();
    //Task_3:
    max();
    //Task_4:
    gasoline();


}