#include<bits/stdc++.h>
using namespace std;
int main()
{
	int a,b,ans;char c;
	cin>>a>>b>>c;
	if(c==43)ans=a+b;
	else if(c==45)ans=a-b;
	else if(c==34)ans=a*b;
	else if(c==47)
	{
		if(b!=0)ans=a/b;
		else
		{
			printf("Divided by zero!");
			return 0;
		}
	}
	if(c!=43&&c!=45&&c!=34&&c!=47)
	{
		printf("Invalid operator!");
		return 0;
	}
	printf("%d",ans);
	return 0;
}