import java.util.Scanner;

public class Main {

	static Scanner scan = new Scanner(System.in);

	public static void main(String[] args) {
		int n = scan.nextInt();

		long first = scan.nextLong();
		long max = first;
		long min = first;
		for(int i = 1; i < n; i++) {
			long a = scan.nextLong();
			if(max < a) {
				max = a;
			}else 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