#include<stdio.h>
int main()
{
	int n, k;
	scanf("%d%d", &n, &k);
	int a, i;
	int max, min;
	max = 0;
	min = 1000000009;
	for (i = 0; i < n; i++)
	{
		scanf("%d", &a);
		if (min > a)min = a;
		if (max < a)max = a;
	}
	printf("%d\n", max - min);
	return 0;
}