using System;
using System.IO;
using System.Linq;

class Program
{
    static void Main()
    {
        using (var sr = new StreamReader(Console.OpenStandardInput()))
        {
            sr.ReadLine();
            var a = sr.ReadToEnd()
                .Split(new string[] { Environment.NewLine },
                    StringSplitOptions.RemoveEmptyEntries)
                .Select(long.Parse);

            Console.WriteLine(a.Sum());
        }
    }
}