package main

import (
	"fmt"
	"sort"
)

func resolve(N, K int, n []int) int {
	sort.Ints(n)
	return n[N-1] - n[0]
}

func main() {
	var N, K int
	fmt.Scanf("%d\n%d\n", &N, &K)
	n := make([]int, N)
	for i := 0; i < N; i++ {
		fmt.Scanf("%d\n", &n[i])
	}
	fmt.Println(resolve(N, K, n))
}