import java.util.*;
public class Main{
	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();
        }
      	Arrays.sort(a);
      	System.out.println(a[n-1]-a[0]);
    }
}