#include <stdio.h>
int main(){
int n,a,b,t;
scanf("%d%d",&n,&a);
scanf("%d%d",&a,&b);b>a&&(a^=b^=a^=b);
while(n-->2){scanf("%d",&t);a=t>a?t:a;b=t<b?t:b;}
printf("%d",a-b);
return 0;
}