im tired
package de.codegym.task.task04.task0442;
/*
Addieren
*/
import java.io.*;
import java.util.Scanner;
public class Solution {
public static void main(String[] args) throws Exception {
//schreib hier deinen Code
//String x = reader.readLine();
//Scanner scan = new Scanner(System.in);
while(true){
BufferedReader reader = new BufferedReader(new InputStreamReader(System.in));
int sum = 0;
int num = Integer.parseInt(reader.readLine());
sum += num;
if(num == -1)
System.out.println(sum);
break;
}
}
}