#!/usr/bin/env python3
#fileencoding: utf-8

from math import sqrt

M = N = int(input())
count = 0
i = 2
while M >= i*i:
    while N % i == 0:
        N //= i
        count += 1
    i += 1
if N > 1:
    count += 1
print("YES" if count >= 3 else "NO")