import java.util.*;
import java.math.BigInteger;
/**
 * UVa Problem 424 Integer Inquiry 
 * Accepted JAVA 0.180secs 2012-10-11 22:27:30
 */
class Main
{
    Scanner scan = new Scanner (System.in);

    public static void main(String args[])
    {
        Main app = new Main();
        app.run();
    }
    void run()
    {
        BigInteger sum = BigInteger.ZERO;
       // process each input case
       while (scan.hasNext())
       {
            String input = scan.nextLine();
            // Compute the sum
            sum = sum.add(new BigInteger(input));
       }
       System.out.println(sum.toString());
    }
}