#include <stdio.h>

int main() {
	int n,k,m,max=0,min=1001,i;
	scanf("%d%d",&n,&k);
	for (i=0;i<n;i++) {
		scanf("%d",&m);
		max=max<m?m:max;
		min=min>m?m:min;
	}
	printf("%d\n",max-min);
	return 0;
}