using System;
using System.Linq;
public class Hello{
    public static void Main(){
       
        var points = Console.ReadLine().Split().Select(int.Parse).ToList();
        
        float validP  = points.Sum() - points.Max() - points.Min();
        float ans = (validP / (points.Count - 2));
        
        Console.WriteLine(ans.ToString("F2"));
        
    }
}