func main()
	var n: int :: cui@inputInt()
	var k: int :: cui@inputInt()
	var a: []int :: #[n + 1]int
	for i(1, n)
		do a[i] :: cui@inputInt()
	end for
	do a.sort()
	do cui@print("\{a[n] - a[1]}\n")
end func