#include<iostream>
using namespace std;

int main() {
    char op;
    int a, b;
    
    cin >> op;
    cin >> a >> b;
   switch(op) { 
    
    case '+':
    cout << a + b;
    break;
    
     case '-':
    cout << a - b;
    break;
    
     case '*':
    cout << a * b;
    break;
    
     case '/':
     if (b == 0)
     cout << "Invalid input";
     
     else
     cout << a / b;
     break;
     
     default:
     cout << "Invalid input;"
    
    
    }
    
    return 0;
}