#include<bits/stdc++.h>
using namespace std;
int main()
{
int a,b,ans;
char c;
cin>>a>>b>>c;
if(c=='+')
{
ans=a+b;
}
else if(c=='-')
{
ans=a-b;
}
else if(c=='')
{
ans=ab;
}
else if(c=='/')
{
ans=a/b;
if(a/b==0)
{
cout<<"Divided by zero!"<<endl;
}
}
else
{
cout<<"Invalid operator!"<<endl;
}
cout<<ans<<endl;
return 0;
}
