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package com.javarush.task.task04.task0442;
import java.io.BufferedReader;
import java.io.InputStreamReader;
/*
Π‘ΡΠΌΠΌΠΈΡΠΎΠ²Π°Π½ΠΈΠ΅
*/
public class Solution {
public static void main(String[] args) throws Exception {
BufferedReader reader = new BufferedReader(new InputStreamReader(System.in));
int counter = 0;
while(true) {
int number = Integer.parseInt(reader.readLine());
counter = counter + number;
if(number == -1) {
break;
}
System.out.println(counter);
}
}
}