# include <stdio.h>
int main()
{
    int n,i;
    long max;
    long min;
    scanf("%d",&n);
    int arr[n];
    for(i=0;i<n;i++)
    {
        long j;
        scanf("%ld",&j);
        arr[i]=j;
    }
    max=arr[0];
    min=arr[0];
    for(i=0;i<n;i++)
    {
        if(arr[i]>max)
        max=arr[i];
        if(arr[i]<min)
        min=arr[i];
    }
    printf("%ld",max-min);


    return 0;
}