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