#450 minicalc

#include <iostream>

using namespace std;

int main()
{
    int a,b,c;
    cin>>a>>b>>c;
    if(c==1)
    cout<<a+b;
    if(c==2)
    cout<<a-b;
    if(c==3)
    cout<<a*b;
    if(c==4)
    cout<<a/b;
    if(c==5)
    cout<<a%b;
    return 0;
}