import java.util.*;

public class Main{
    public static void main(String[] args){
        Scanner sc = new Scanner(System.in);

        int N = sc.nextInt();
        int[] a = new int[N];
        int max = 0;
        int min = 1001;

        for(int i=0; i<N; i++){
            a[i] = sc.nextInt();
            max = Math.max(max, a[i]);
            min = Math.min(min, a[i]);
        }

        System.out.println(max - min);
    }
}