include<bits/stdc++.h>

using namespace std; int main() {

double a,b;
char c;
cin>>a>>b>>c;
if(c=='+')
{
    cout<<a+b;
}
else if(c=='-')
{
    cout<<a-b;
}
else if(c=='*')
{
    cout<<a*b;
}
else if(c=='/')
{
    printf("%.2lf",1.0*a/b);
}
else if(c==' ')
{
	cout<<a*b;
}
return 0;

}