#include<stdio.h>
int main(void){
	int max = 0,min = 1000,n,k,i,j;
	int nx[10];
	scanf("%d%d",&n,&k);
	for(i=0;i<n;i++) scanf("%d",&nx[i]);
	for(i=0;i<n;i++){
		if(max<nx[i]) max = nx[i];
		if(min>nx[i]) min = nx[i];
	}
	printf("%d\n",max - min);
	return 0;
}