import java.util.*;

public class Main {
    public static void main(String[] args){
        Scanner sc = new Scanner(System.in);

        int N = sc.nextInt();
        int[] points = new int[N];

        for(int i = 0; i<N ;i++){
            points[i] = sc.nextInt();
        }

        Arrays.sort(points);
        System.out.println(points[N-1] - points[0]);
    }
}
