
import java.util.Arrays;
import java.util.Scanner;

public class Main {
    public static void main(String[] args){
    Scanner sc = new Scanner(System.in);
    int N = sc.nextInt();
    int[] a = new int[N];
    for(int i = 0; i<N; i++){
        a[i] = sc.nextInt();
    }
    Arrays.sort(a);
    System.out.println((a[a.length-1] - a[0]));
    }

}
