#include<cstdio>
int main(void)
{
    int b, max = -1, min = 1001;
    scanf("%d", &b);
    for (int i = 0; i < b; i++)
    {
        int w;
        scanf("%d", w);
        if (w > max)
            max = w;
        if (min > w)
            min = w;
    }
    printf("%d", max - min);
    return 0;
}