using System;
using System.Collections.Generic;
using System.Text;

namespace ConsoleApplication5
{
    class Program
    {
        static void Main(string[] args)
        {   string x;
            long celkem = 0;

            while((x = Console.ReadLine()) != null)
                celkem += Convert.ToInt32(x);

            Console.WriteLine(celkem);
        }
    }
}