import java.util.Scanner;

public class Main
{
	public static void main(String[] args)
	{
		Scanner scan = new Scanner(System.in);
		int n = scan.nextInt(), a, max = Integer.MIN_VALUE, min = Integer.MAX_VALUE;
		for (int i = 0; i < n; i++)
		{
			a = scan.nextInt();
			max = a > max ? a : max;
			min = a < min ? a : min;
		}
		scan.close();
		System.out.println(max - min);
		
	}
}
/tmp/hf-datasets-cache/medium/datasets/42704881117311-config-parquet-and-info-qiankunmu-Project_CodeNet-896c9d36/hub/datasets--qiankunmu--Project_CodeNet_Python800_and_Java250/snapshots/c899fde44a77ba1cc14973ed3de064e4ff3aadc7/Project_CodeNet_Java250.tar.gz