#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;
}