A = int(input())
B = 2 * A
divisors = set()

for i in range(1, int(B**0.5) + 1):
    if B % i == 0:
        divisors.add(i)
        divisors.add(B // i)

found = False
for k in divisors:
    if k >= 3:
        quotient = B // k
        if (quotient - k + 1) % 2 == 0:
            found = True
            break

print("YES" if found else "NO")