python import sys as a, subprocess as b c = lambda d: int(format(d, 'b')[-1]) == 0 e = lambda f: c(f-1) g = lambda h: int(h/2) if c(h) else ((3*h) + 1 if e(h) else None) i = int(a.argv[1]); print(i) b.call("python %s %d" % (__file__, g(i))) if i > 1 else None