/* -*- coding: utf-8 -*-
 *
 * 1256.cc:  No.1256 連続整数列 - yukicoder
 */

#include<cstdio>
#include<cstdlib>
#include<cstring>
#include<cmath>
#include<iostream>
#include<string>
#include<vector>
#include<map>
#include<set>
#include<stack>
#include<list>
#include<queue>
#include<deque>
#include<algorithm>
#include<numeric>
#include<utility>
#include<complex>
#include<functional>
 
using namespace std;

/* constant */

/* typedef */

/* global variables */

/* subroutines */

/* main */

int main() {
  int a;
  scanf("%d", &a);

  for (int i = 3;; i++) {
    int p = i * (i + 1) / 2;
    if (a < p) break;
    if ((a - p) % i == 0) {
      puts("YES");
      return 0;
    }
  }

  puts("NO");
  return 0;
}