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]);
    }
}