#include <iostream>

int main () {
	long long n;
	std::cin >> n;

	long long i = 1L, s = 0L;

	bool result = false;
	while (true) {
		s += i;
		if (s == n) {
			result = true;
			break;
		} else if (s > n) {
			break;
		}
		++i;
	}
	std::cout << (result ? "YES" : "NO") << std::endl;
	if (result) std::cout << i << std::endl;
}