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 = 0;
		int max = 0;
		int min = 1000000001;

		for (int i = 0; i < n; i++) {

			a = sc.nextInt();

			if (max < a) {
				max = a;
			}

			if (min > a) {
				min = 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