import java.io.*;
class Numbritarbija extends Thread{
  PipedInputStream lugemisvoog=new PipedInputStream();

  public void run(){
   int summa=0;
   int n=0;  
   try{
    DataInputStream andmelugemisvoog=new DataInputStream(lugemisvoog);
    while(true){
      n++;
      int a=andmelugemisvoog.readInt();
      summa+=a;
      if(n%1000==0){System.out.println(summa);}
    }
   }catch(Exception e){
     System.out.println(e);
   }
  }
}