import java.io.FileReader;
import java.io.IOException;
import java.util.Scanner;

public class Main {

    public static void main(String[] args) {
        Long summ = readSum();
        System.out.println("Hello World!/n The sum is " + summ == null ? "Sorry! An error occurred." : summ);
    }

    static Long readSum() {
        Long summ = 0L;
        try {
            Scanner in = new Scanner(new FileReader("numbers.txt"));
            while (in.hasNext()) {
                summ += Long.parseLong(in.next());
            }
            in.close();
        } catch (IOException e) {
            return null;
        }
        return summ;
    }
}