import java.lang.reflect.Array;
import java.util.*;

public class Main {

    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        int n = sc.nextInt();
        int[] arr = new int[n];

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

        Arrays.sort(arr);

        int distance = arr[arr.length-1] - arr[0];
        System.out.println(distance);
    }
}
