using System;

public class Program

{

    public static void Main()

    {

        Console.WriteLine(" n = ");

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

        var oddSum = 0;

        var evenSum = 0;

        for (int i =0;i<n;i++);

        {

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

            if ( i % 2== 0)

            {

                evenSum += element;

            }

            else

            {

                oddSum += element;

    }

}