import java.util.Scanner;

public class Main {
	public static void main(String[] args) {
		Scanner scanner = new Scanner(System.in);
		int n = scanner.nextInt();
		int a1 = scanner.nextInt();
		int min = a1;
		int max = a1;
		for (int i=1; i<n; i++){
			int a = scanner.nextInt();
			min = Math.min(min, a);
			max = Math.max(max, a);
		}
		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