package main

import (
	"fmt"
)

func main() {
	var n, k int
	fmt.Scan(&n, &k)
	min, max := 1001, 0
	for i := 0; i < n; i++ {
		var x int
		fmt.Scan(&x)
		if x < min {
			min = x
		}
		if x > max {
			max = x
		}
	}
	fmt.Println(max - min)
}