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

namespace yukikoda
{
    class Program
    {
        static void Main(string[] args)
        {
            double[] d = ConvertStringArrayToDoubleArray(Console.ReadLine().Split());
            double ans = 0;
            foreach (var item in d)
            {
                ans += item;
            }

            ans = (ans - d.Max() - d.Min()) / (d.Length - 2);

            Console.WriteLine(ans.ToString("F2"));
        }

        static double[] ConvertStringArrayToDoubleArray(string[] array)
        {
            return Array.ConvertAll(array, str => double.Parse(str));
        }

    }
}