import java.util.Scanner;
public class Main {
  public static void main(String[] args) {
    Scanner sc = new Scanner(System.in);
    int n = sc.nextInt();
    int max = sc.nextInt();
    int min = max;
    for(int i = 1; i<n; i++) {
      int a = sc.nextInt();
      if(a > max){
        max = a;
      }
      if(a < min){
        min = a;
      }
    }
    System.out.println(max - min);
  }
}
