#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; }