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

using namespace std;

int main() {

	long long n;
	cin >> n;
	double m = (sqrt(8 * n + 1) - 1) / 2;
	if (ceil(m) == m ){
		cout << "YES" << endl;
		cout << (int)m << endl;
		return 0;
	}
	else {
		cout << "NO" << endl;
		return 0;
	}

	return 0;
}