class Program
    {
        static void Main(string[] args)
        {
            int numCount = int.Parse(Console.ReadLine());
            string[] numList = Console.ReadLine().Split(' ');
            decimal[] sum = new decimal[numCount];
            for(int i = 0; i < numCount; i++)
            {
                sum[i] = decimal.Parse(numList[i]);
            }
            Array.Sort(sum);
            if(numCount%2 != 0)
            {
                Console.WriteLine(sum[numCount / 2]);
            }
            else
            {
                Console.WriteLine((sum[(numCount-1) / 2] + sum[numCount / 2])/2);
            }
        }
    }