def leap(x, d=400):
	return (
		not d and [d]
		or
		x == 0 and [[1, 0, 1][d >> 6 & 3]]
		or
		x < d and [leap(x, [0, 4, 100][d >> 6 & 3])]
		or
		[leap(x - d, d)]
	)[0]