#include <stdio.h>
int main()
{
    int n;
    scanf("%d",&n);
    int arr[100];
    int max = 0;
    int min = 100;
    for(int i = 0;i<n;i++){
        scanf("%d",&arr[i]);
        if(arr[i]>max){
            max = arr[i];
        }
        if(arr[i]<min){
            min = arr[i];
        }
    }
   printf("%d",max-min);
    return 0;
}