include<bits/stdc++.h>

using namespace std;

int main() {

double a,b;
char c;
cin>>a>>b>>c;
if(c=='+')
cout<<a+b;
if(c=='-')
cout<<a-b;
if(c=='*')
cout<<a*b;
if(c=='/')
printf("%.2f",a/b);
return 0;

}