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

#define ID_DODAJ    1
#define ID_ODEJMIJ  2
#define ID_POMNOZ   3
#define ID_PODZIEL  4
#define ID_EXIT     5

int f_Dodawanie(int a, int b){return a+b;}
int f_Odejmowanie(int a, int b){return a-b;}
int f_Mnozenie(int a, int b){return a*b;}
int f_Dzielenie(int a, int b){return a/b;}
int f_Menu(){
    system("cls");
    cout << "1. +" << endl << "2. -" << endl << "3. *" << endl << "4. /" << endl << "5. exit" << endl;
    int wybor;
    do
    {cin >> wybor;
    }while(wybor < 1 || wybor > 5);
    return wybor;
}

int main()
{
    int a, b;
    switch(f_Menu())
    {
        case ID_DODAJ:
            cin >> a >> b;
            cout << f_Dodawanie(a, b) << endl;
            break;
        case ID_ODEJMIJ:
            cin >> a >> b;
            cout << f_Odejmowanie(a, b) << endl;
            break;
        case ID_POMNOZ:
            cin >> a >> b;
            cout << f_Mnozenie(a, b) << endl;
            break;
        case ID_PODZIEL:
            cin >> a >> b;
            cout << f_Dzielenie(a, b) << endl;
            break;
        case ID_EXIT:
            break;
    }
    return 0;
}