# -*- coding: utf-8 -*-

A = int(input())

def make_div(n):
    lower_divisors , upper_divisors = [], []
    i = 1
    while i*i <= n:
        if n % i == 0:
            lower_divisors.append(i)
            if i != n // i:
                upper_divisors.append(n//i)
        i += 1
    return lower_divisors + upper_divisors[::-1]

div = make_div(A)[1::]


for d in div:
    temp = (2*A//d - d + 1)//2
    if temp-0.01 < (2*A/d - d + 1)/2 < temp+0.01 and temp > 0:
        print("YES")
        quit()
print("NO")