import java.util.Arrays;
import java.util.Scanner;

public class Main {

	public static void main(String[] args) {
		
		Scanner sc = new Scanner(System.in);
		int N = sc.nextInt();
		int[] house = new int[N];
		
		for (int i = 0; i < N; i++) {
			house[i] = sc.nextInt();
		}
		
		Arrays.sort(house);
		
		System.out.println(house[N - 1] - house[0]);
	}

}
