#include<stdio.h>

int main(void)
{
	int i, n, k, min = 1001, max = 0, pa[10];
	scanf("%d %d", &n, &k);//無しでもいけそう
	for (i = 0; i < n; i++) {
		scanf("%d", &pa[i]);
		if (min > pa[i])min = pa[i];
		if (max < pa[i])max = pa[i];
	}
	printf("%d\n", max - min);
	return 0;
}