import java.util.*;

public class Main {
	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		int nodes = sc.nextInt();
		int min = Integer.MAX_VALUE;
		int max = Integer.MIN_VALUE;
		for (int i = 0; i < nodes; i++) {
			int num = sc.nextInt();
			min = Math.min(num, min);
			max = Math.max(num, max);
		}
		System.out.println(max - min);
	}
}