Main.java

import java.util.Scanner;

class Main {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        int sum = 0;
        int num;
        boolean barrier = false;
        while (!barrier) {
            num = scanner.nextInt();
            sum += num;
            barrier = sum >= 1000;
            if (barrier) {
                sum -= 1000;
            } else if (num == 0) {
                break;
            }
        }

        System.out.println(sum);
    }
}