import java.util.Scanner;

public class Main {

	public static void main(String[] args) {
		Scanner scanner = new Scanner(System.in);
		int N = scanner.nextInt();
		int Max = 1, Min = 1000000000;

		for (int n = 0; n < N; n++) {
			int A = scanner.nextInt();
			Max = Math.max(Max, A);
			Min = Math.min(Min, A);
		}
		scanner.close();
		int A = Max - Min;
		System.out.println(A);

	}
}
/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