#include <stdio.h>

int main()
{
    int n = 0, i = 0, m = 0;
    int max = 0, min = 0;
    scanf("%d",&n);
    scanf("%d",&m);
    max = m, min = m;
    for (i = 0; i < (n-1); i++)
    {
        scanf("%d",&m);
        if(m >= max)
            max = m;
        if(m <= min)
            min = m;

    }
    printf("%d",(max-min));
    return 0;
}