java简单实现

import java.util.*;
import java.util.stream.*;

public class Main {
    private static final Scanner scanner = new Scanner(System.in);

    public static void main(String[] args) {
        for(int n = scanner.nextInt(); n != 0; n = scanner.nextInt())
            System.out.println(IntStream.range(0, n)
                               .mapToLong(i -> scanner.nextInt()).sum());
    }
}