#include <iostream>
using namespace std;

int main() {
    int x;
    char op;
    int y;
    cin>>x;
    cin>>op;
    cin>>y;
     switch (op) {
        case '+':       //case means if operator(op) = 'whatever the case is'
        cout<<x+y<<endl;   //print
        break;           //break statement

        case '-':
        cout<<x-y;
        break;

        case '*':
        cout<<x*y;
        break;

        case '/':
        cout<<x/y;
        break;
        default : 
        cout<<" invalid oprator";
        break;
    }
}