// Sum.java

import java.util.List;
import java.util.Arrays;

public class Sum {
    public static int sum(List<Integer> numbers) {
        if (numbers.size() == 0) {
            return 0;
        } else {
            return numbers.get(0) + sum(numbers.subList(1, numbers.size()));
        }
    }

    public static void main(String[] args) {
        Integer[] vals = {1, 2, 3, 4, 5, 6, 7, 8, 9, 10};
        List<Integer> numbers = Arrays.asList(vals);
        System.out.println("Sum is: " + sum(numbers));
    }
}