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