package com.javarush.task.task04.task0442;
/*
Суммирование
*/
import java.io.BufferedReader;
import java.io.InputStreamReader;
public class Solution {
public static void main(String[] args) throws Exception {
BufferedReader reader = new BufferedReader(new InputStreamReader(System.in));
int sum =0;
while (true) {
String sNum = reader.readLine();
int number = Integer.parseInt(sNum);
sum = sum + number;
System.out.println(sum);
if (number == -1){
break;}
}
}
}