#include <stdio.h>
#define max(a,b) a>b?a:b
#define min(a,b) a<b?a:b
int main(){
	int n, k, x=1, y=1000;
	scanf("%d %d", &n, &k);
	while(n--){
		scanf("%d", &k);
		x = max(x, k);
		y = min(y, k);
	}
	printf("%d\n", x-y);
	return 0;
}