import java.util.Scanner;

public class Main {
	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		
		int n = sc.nextInt();
		
		int max = sc.nextInt();
		int min = max;
		
		for (int i = 1; i < n; i++) {
			int a = sc.nextInt();
			if (a > max)			max = a;
			else if (a < min)		min = a;
		}
		
		System.out.println(Math.abs(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