#include <iostream>
using namespace std;
//Tests an entered number for perfect-ness//
//A positive whole number is ÔperfectÕ if //
//the sum of its divisors (apart from itself) //
//equals the number.//

int main() {

	int n,i,a;
	cout << "Enter the number you want to check for perfection: ";
	cin >> n;
	
	a=1; // sum of divisors so far -- 1 is a divisor of all whole numbers
	for (i=2;i<n;i++) {
		if (n%i==0)
			a=a+i; //add the newly discovered divisor, i, to sum of divisors
	}
    if (n==a)
		cout << "Yep, that's one perfect number alright.\n";
	else
		cout << "Nope, that were no perfect number.\n";
	
	return 0;
}