package main

import "fmt"

func main() {
	var N, K int
	fmt.Scan(&N, &K)

	maxNum := 1
	minNum := 1000

	for i := 0; i < N; i++ {
		var input int
		fmt.Scan(&input)

		if input > maxNum {
			maxNum = input
		}
	
		if input < minNum {
			minNum = input
		}
	}

	fmt.Println(maxNum - minNum)
}