I can't go anyway with task! How many inputs does the task take. I'm very confused..

package com.codegym.task.task04.task0442;
/*
Adding
*/
import java.io.*;
public class Solution {
public static void main(String[] args) throws Exception {
//write your code here
BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
int numbers = 0;
int sum = 0;
while (true){
numbers = Integer.parseInt(br.readLine());
sum = numbers + sum;
if (numbers != -1){
sum = numbers + sum;
}else{
sum = numbers + sum;
break;
}
System.out.println(sum);
}
}
}