package main

import "fmt"

func MinIntS(v []int) (m int) {
	if len(v) > 0 {
		m = v[0]
	}
	for i := 1; i < len(v); i++ {
		if v[i] < m {
			m = v[i]
		}
	}
	return
}

func MaxIntS(v []int) (m int) {
	if len(v) > 0 {
		m = v[0]
	}
	for i := 1; i < len(v); i++ {
		if v[i] > m {
			m = v[i]
		}
	}
	return
}

func main() {
	var N, K, tmp int
	fmt.Scan(&N)
	fmt.Scan(&K)
	n := make([]int, 0, N)
	for i := 0; i < N; i++ {
		fmt.Scan(&tmp)
		n = append(n, tmp)
	}
	min := MinIntS(n)
	max := MaxIntS(n)
	fmt.Println(max - min)
}