#define _CRT_SECURE_NO_WARNINGS
#include <stdio.h>

int main(void) {
	int n, k, max = 1, min = 10000;
	int i, t;

	scanf("%d", &n); scanf("%d", &k);
	for (i = 0; i < n; i++) {
		scanf("%d", &t);
		if (max < t)
			max = t;
		if (min > t)
			min = t;
	}

	printf("%d\n", max - min);

	return 0;
}