import java.util.Scanner;

public class Main {

	public static void main(String[] args) {

		Scanner sc = new Scanner(System.in);

		int n = sc.nextInt();
		int min = 0;
		int max = 0;

		for (int i=1; i<=n; i++){
			int a = sc.nextInt();
			if (i == 1){
				min = a;
				max = a;
			} else {
				min = Math.min(min, a);
				max = Math.max(max, a);
			}
		}
		System.out.println(max - min);
	}

}
