#include <bits/stdc++.h>
using namespace std ;
int main()
{
	int a,b ;
	char op;
	cin>>a>>b>>op; // 输入
	if(b==0 and op=='/') //先判断除0
	{
		cout<<"Divided by zero!"; 
	}
	else if(op=='+') // 依次处理加减乘除
	{
		cout<<a+b;
	}
	else if(op=='-')
	{
		cout<<a-b;
	}
	else if(op=='*')
	{
		cout<<a*b;
	}
	else if(op=='/')
	{
		cout<<a/b;
	}
	else //输入的运算符无效时
	{
		cout<<"Invalid operater!";
	}
	return 0;
}