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);

    int x = a[0] -a[n-1];
    int y = Math.abs(x);

    System.out.println(y);




  }

}