package work;
import java.io.BufferedReader;
import java.io.FileReader;
import java.io.IOException;
import java.util.Scanner;
 
public class Work
{ public static void main(String[] args)
  { try
    { FileReader in      = new FileReader( "input.txt");
      BufferedReader bin = new BufferedReader(in);
      Scanner          s = new Scanner(bin);
      long sum=0;
      while (s.hasNextLong()) sum+=s.nextLong();      
      System.out.println(sum);
    }
    catch (IOException e) {}
  }
}