#include<bits/stdc++.h>
using namespace std;
int main(){
	int n1,n2;
	char op;
	cin>>n1>>n2>>op;
	switch(op){
	case '+':cout<<n1+n2;break;
	case '-':cout<<n1-n2;break;
	case '*':cout<<n1*n2;break;
	case '/':if(n2!=0) cout<<n1/n2; else cout<<"Divided by zero!";break;
	default:cout<<"Invalid operator!";
}
	return 0;
}

用一下冷门的思维驰语句