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

using namespace std;

int main() {

	long long n;
	int i = 0;
	int sum = 0;
	cin >> n;
	do {
		i++;
		sum += i;
		
	} while (n > sum);

	if (n == sum) {
		cout << "YES" << endl;
		cout << i << endl;
	}
	else cout << "NO" << endl;


	return 0;
}