/*
 * author : cody
 * created : 10-08-2024 10:27
*/
#include <bits/stdc++.h>
using namespace std;
#define ll long long
double a, b;
char c;
int main()
{ 
 cin >> a >> b >> c;
 cout << setprecision(1) << fixed;
 if (c == '+') cout << a + b;
 else if (c == '-') cout << a - b;
 else if (c == 'x') cout << a * b;
 else if (c == '/') cout << a / b;
 return 0;
}

/*
khanhtaon (*︾▽︾)
*/
#include <bits/stdc++.h>
using namespace std;
double a, b;
char c;
int main()
{
    cin >> a >> b >> c;
    if(c == '+')
        cout << setprecision(1) << fixed << a+b;
    else if(c == '-')
        cout << setprecision(1) << fixed << a-b;
    else if(c == 'x')
        cout << setprecision(1) << fixed << a*b;
    else
        cout << setprecision(1) << fixed << a/b;
    return 0
}