#include <stdio.h>

int main() {
    int a,b,cnt=0,min,max;
    scanf("%d",&a);
    scanf("%d",&b);
    cnt=b;
    scanf("%d",&b);
    if (cnt>b) {
        min=b;
        max=cnt;
    }else if (cnt<b) {
        max=b;
        min=cnt;
    }
    for (int i=3;i<=a;i++) {
        scanf("%d",&b);
        if (min>b) {
            min=b;
        }else if (max<b) {
            max=b;
        }
    }
    printf("%d",max-min);
    return 0;
}