package main

import "fmt"

func min(a, b int) int {
	if a < b {
		return a
	}
	return b
}
func max(a, b int) int {
	if a > b {
		return a
	}
	return b
}

func main() {
	var N, K int
	fmt.Scan(&N, &K)
	maxa := 0
	mina := int(1e9)
	for i := 0; i < N; i++ {
		var v int
		fmt.Scan(&v)
		maxa = max(maxa, v)
		mina = min(mina, v)
	}
	fmt.Println(maxa - mina)
}