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

int main() {
  ios::sync_with_stdio(false);
  cin.tie(0);

  ll A; cin >> A;
  A *= 2;
  for (ll i = 1; i * i <= A; i++) {
    if (A % i == 0) {
      ll x, y, N, M;
      x = i, y = A / i;
      if ((x + y - 1) % 2 != 0) continue;

      if (x < y) swap(x, y);
      N = (x + y - 1) / 2;
      M = (x - y - 1) / 2;
      if (N <= 0 || M <= 0) continue;
      if (M + 3 > N) continue;
      cout << "YES" << '\n';
      return 0;
    }
  }
  cout << "NO" << '\n';
  return 0;
}