import java.util.Scanner;

public class Main {

	public static void main(String[] args) {
		try (Scanner sc = new Scanner(System.in)) {
			int N = sc.nextInt();
			int min = Integer.MAX_VALUE;
			int max = Integer.MIN_VALUE;

			for (int i = 0; i < N; i++) {
				int tmp = sc.nextInt();
				if (tmp < min) {
					min = tmp;
				}
				if (max < tmp) {
					max = tmp;
				}
			}

			System.out.println(max - min);
		}
	}
}