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[] zahyo = new int[n];
		for(int i=0; i<n; i++)
			zahyo[i] = sc.nextInt();
		sc.close();

		Arrays.sort(zahyo);
		System.out.println(zahyo[n-1] - zahyo[0]);
	}
}
