#include<iostream>
#include<string>
#include<math.h>
#include<algorithm>

using namespace std;

int main() {

	long n,m;
	cin >> n;
	m = sqrt(2*n);
	if (m*(m + 1) / 2 == n) {
		cout << "YES" << endl;
		cout << m << endl;
	}
	else {
		cout << "NO" << endl;
	}

	return 0;
}