import java.io.*;
import java.util.*;
import java.text.*;
import java.math.*;
import java.util.regex.*;


class Difference 
{
  	private int[] elements;
  	public int maximumDifference;
	// Add your code here
    Difference(int[] numbers)
    {
        this.elements=numbers;
    }
    void computeDifference()
    {
        Arrays.sort(elements);
        maximumDifference = Math.abs(elements[elements.length - 1] - elements[0]);
    }
} // End of Difference class


public class Solution 
{

    public static void main(String[] args) 
    {
        Scanner sc = new Scanner(System.in);
        int n = sc.nextInt();
        int[] a = new int[n];
        for (int i = 0; i < n; i++) 
        {
            a[i] = sc.nextInt();
        }
        sc.close();

        Difference difference = new Difference(a);

        difference.computeDifference();

        System.out.print(difference.maximumDifference);
    }
}
