using System;

public class Program

{

    public static void Main()

    {

        //// a ////

        double[] exam_scores = {100, 91, 70, 65};

        Array.Sort(exam_scores);

        Array.Reverse(exam_scores);

        double sum = 0;

        for (int i = 0; i <= 2; i++) {

            sum += exam_scores[i];

        }

        Console.WriteLine("avg: " + sum / 3);

        //// b ////

        Console.WriteLine("weighted avg: " + ((0.6 * exam_scores[0]) + (0.3 * exam_scores[1]) + (0.1 * exam_scores[2]) / 3));

    }

}