#include <stdio.h>

int main() {
    
    int n = 0, num = 0;
    scanf("%d", &n);

    
    scanf("%d", &num);
    int max = num, min = num;//第一个数给max和min赋初值
    n -= 1;//已经赋值一次,还剩下n-1个数
    while(n > 0)
    {
        scanf("%d", &num);//找到最大值、最小值
        if (max < num) {
            max = num;
        }
        //求最小
        if (min > num) {
            min = num;
        }
        n--;
    }
    //求最大差
    printf("%d", max - min);

    return 0;
}