#include <bits/stdc++.h>
using namespace std;

int main() {
	int64_t n;
	cin >> n;
	for (int64_t i = 1; i * (i + 1) / 2 <= n; i++) {
		if (i * (i + 1) / 2 == n) {
			cout << "YES" << endl;
			cout << i << endl;
			return 0;
		}
	}
	cout << "NO" << endl;
	return 0;
}