C++ :

#include<bits/stdc++.h>
using namespace std;
char s;
int a,b;
int main()
{
	cin>>a>>s>>b;
	if(s=='-') cout<<a-b;	
	if(s=='+') cout<<a+b;
	if(s=='*') cout<<a*b;
	if(s=='/') 
		if(b==0) cout<<"NO";
		else cout<<a/b;
	return 0;
}