import java.util.Arrays;
import java.util.Scanner;

/**
 * @author varun on 7/1/2018
 * @project CompetitiveProgramming
 */
public class Main {
    public static void main(String args[]) {
        Scanner scanner = new Scanner(System.in);
        int N = scanner.nextInt();
        int[] arr = new int[N];
        for (int i = 0; i < N; ++i) arr[i] = scanner.nextInt();
        Arrays.sort(arr);
        System.out.println(arr[N-1] - arr[0]);
    }
}

/tmp/hf-datasets-cache/medium/datasets/42704881117311-config-parquet-and-info-qiankunmu-Project_CodeNet-896c9d36/hub/datasets--qiankunmu--Project_CodeNet_Python800_and_Java250/snapshots/c899fde44a77ba1cc14973ed3de064e4ff3aadc7/Project_CodeNet_Java250.tar.gz