#include <iostream>
using namespace std;
int main()
{
    int num1,num2,operation;
    cout<<"Enter two numbers first and then operand between 0-3 : "<<endl;
    cin>>num1>>num2>>operation;
    if(cin.fail()){cout<<"Wrong input"<<endl; return 0;}
    if((num1>=0 && num1 <=15) && (num2>=0 && num2 <=15 && num2!=0) && operation >=0 && operation <=3)
    {
        switch (operation){
            case 0 : cout<<((num1+num2)%16)<<endl;
                break;
            case 1 :
            {
                //dif stands from difference
                short dif=num1-num2;
                if(dif<0)
                    dif=dif+16;
                cout<<(dif%16)<<endl;
                break;
            }
            case 2 : cout<<((num1*num2)%16)<<endl;
                break;
            case 3 : cout<<((num1/num2)%16)<<endl;
                break;
        }

    }
    else cout<<"Wrong input"<<endl;
    return 0;