import java.io.*;
import java.math.BigInteger;

public class prob13 {
  public static void main(String args[])
  {
    String s;
    BigInteger sum = new BigInteger("0");
    BigInteger newval;
    try {
      FileInputStream fstream = new FileInputStream("prob13data.txt");
      DataInputStream in = new DataInputStream(fstream);
      while (in.available() != 0) {
        s = in.readLine();
        newval = new BigInteger(s);
        sum = sum.add(newval);
      }
      in.close();
    } catch (Exception e) {
      System.err.println("Error");
    }
    s = sum.toString();
    System.out.println(s.substring(0,10));
  }
}