#include <bits/stdc++.h>

using namespace std;

using ll = long long;
using ul = unsigned long;

int main()
{
	ios::sync_with_stdio(false);
	cin.tie(nullptr);

	ll n;
	cin >> n;

	ll sec = (ll)sqrt(n * 2);
	ll nn = sec * (sec + 1) / 2;

	string res = n == nn ? "YES\n" + to_string(sec) : "NO";
	cout << res << "\n";

	return 0;
}