using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace yuki
{
    class Program
    {
        static void Main(string[] args)
        {
            int N = int.Parse(Console.ReadLine());
            decimal A = 0; 

            for (int i = 0; i < N; i++)
            {
                A += decimal.Parse(Console.ReadLine());
            }

            Console.WriteLine(string.Format("{0:f10}",A));
        }
    }
}