// $Id: sumcol.java,v 1.2 2000/10/07 08:41:44 doug Exp $
// http://www.bagley.org/~doug/shootout/

import java.io.*;
import java.util.*;
import java.text.*;

public class sumcol {
    public static void main(String[] args) {
    int sum = 0;
    String line;
        try {
            BufferedReader in = new BufferedReader(new InputStreamReader(System.in));
            while ((line = in.readLine()) != null) {
        sum = sum + Integer.parseInt(line);
            }
        } catch (IOException e) {
            System.err.println(e);
            return;
        }
    System.out.println(Integer.toString(sum));
    }
}