n = int(input())
if n == len("a"):
    print("NO")
else:
    is_prime = True
    for i in range(len("ab"), n):
        s = 'a' * n
        part = s[:len(s) // i]
        if part * i == s:
            is_prime = False
            break
    print("YES" if is_prime else "NO")