package main

import "fmt"

func main() {
	var n, k int
	fmt.Scan(&n, &k)

	mx := 0
	mn := 1001
	for range make([]struct{}, n) {
		var t int
		fmt.Scan(&t)
		if mx < t {
			mx = t
		}
		if mn > t {
			mn = t
		}
	}
	fmt.Println(mx - mn)
}