using System;

public class Program

{

    public static void Main()

    {

    var n = int.Parse(Console.ReadLine());

    float sum = 0;

    do

    {

    var number = float.Parse(Console.ReadLine());

    sum = sum + number;

    n = n-1;

    }while(n > 0);

    Console.WriteLine(sum);

    }

}