class elsocsharp {

  static void Main()
  {
    float summa, last, max, min;
    int i;
    summa=0;
    i=0;
    max=0;
    string s1;

//Foprogram

    System.Console.WriteLine("PLS input numbers seperate ENTER");
    s1=System.Console.ReadLine();
    last=float.Parse(s1);
    min=last;
 
    while (last>=0)
    {
      summa=summa+last;
      i=i+1;
      if (last>max) max=last;
      if (last<min) min=last;
      s1=System.Console.ReadLine();
      last=float.Parse(s1);	
    }
    if (i>2) 
      System.Console.WriteLine("(summa-max-min)/(i-2)= "+(summa-max-min)/(i-2));
    else 
      System.Console.WriteLine("Not enough data!");

  System.Console.Write("Press enter to exit...");
  System.Console.ReadLine();  // enterre var
  }
}