#!/usr/bin/env python

def happynumbers_step(n):
    s = 0
    for c in str(n):
        s += int(c)**2
    return s

def happynumbers(n):
    founds = []
    s = n
    while True:
        founds.append(s)
        s = happynumbers_step(s)
        if s == n:
            return False
        elif s in founds:
            return False
        elif s == 1:
            return True

if __name__ == '__main__':
    from sys import argv
    if len(argv) > 1:
        n = int(argv[1])
    else:
        n = 4
    print("%d is a %s number" % (n,"happy" if happynumbers(n) else "unhappy"))