natural.py

#!/usr/bin/env python3

import sys


def main():
    """
    Q: Why?
    A:
        1/n == 1/a + 1/b, where n, a, b is Natural and a != b
        1/n == 1/a + 1/b
        ab == n(a+b)
        n == ab/(a+b)
        Let's assume:
            a = n + 1
            b = a * n = n(n+1) = n^2 + n
        Then:
            n == ab/(a+b)
            n == (n + 1) * (n^2 + n) / (n + 1 + n^2 + n)
            n == (n + 1) * n *(n + 1) / (n^2 + 2 * n + 1)
            n == (n + 1)^2 * n / (n + 1) ^ 2
            n == n
            So for every n greater than 1, anser is YES.
    """
    inp = int(sys.argv[1])
    if inp == 1:
        print("NO")
    else:
        print("YES")


if __name__ == "__main__":
    main()