def main():
    n = int(input())
    a = True
    b = True
    for i in range(n):
        if a:
            a=False
            continue
        if b:
            b=False
            continue

        if n%i == n%n:
            return 'NO'

    return 'NO' if b else 'YES'

if __name__ == '__main__':
    print(main())