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

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

	int n = scan.nextInt();
	int[] a = new int[n];
	for(int i = 0; i < n; i++){
	    a[i] = scan.nextInt();
	}

	Arrays.sort(a);

	System.out.println(a[n-1]-a[0]);
    }
}
