import java.util.Collections;
import java.util.LinkedList;
import java.util.Scanner;
public class Main {

	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		// 整数の入力
		int N = sc.nextInt();
		LinkedList<Integer> A = new LinkedList<>();
		for(int i = 0; i < N; i++) {
			int a = sc.nextInt();
			A.add(a);
		}

		Collections.sort(A);

		System.out.println(A.getLast() - A.getFirst());
	}
}
/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