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

namespace No9008
{
    public class Program
    {
        static void Main(string[] args)
        {
            int n = int.Parse(Console.ReadLine());

            List<long> list = Console.ReadLine().Split().Select(long.Parse).ToList();
            
            Console.WriteLine(calc(n, list));
        }

        public static long calc(int n, List<long> list)
        {
            long sum = list.Where((num, index) => index < n).Sum();

            return sum;
        }
    }
}