using System;
using System.Collections.Generic;
using System.Linq;
using System.IO;

class Program
{
    static void Main()
    {
        var sw = new StreamWriter(Console.OpenStandardOutput()) { AutoFlush = false };
        var s = Console.ReadLine();
        if (s != s.Trim())
        {
            Console.WriteLine("unexpected spase");
            return;
        }
        var a = s.Split().Select(int.Parse).ToArray();
        Array.Sort(a);
        int ans = (a[1] + a[2] + a[3] + a[4]) * 25;
        sw.WriteLine("{0}.{1:00}", ans / 100, ans % 100);
        sw.Flush();
    }
}