04. Train the Trainers

using System;

public class Program
{
    public static void Main()
    {
        int n = int.Parse(Console.ReadLine()); // num of people in the jury

        int countOfPresentations = 0;
        double totalSumOfGrades = 0;

        string presentation = Console.ReadLine();

        while (presentation != "Finish")
        {
            countOfPresentations++;
            double sumOfGrades = 0;

            // for loop for the grades:
            for (int i = 0; i < n; i++)
            {
                double grade = double.Parse(Console.ReadLine());
                sumOfGrades += grade;
            }
            double averageGrade = sumOfGrades / n;
            Console.WriteLine($"{presentation} - {averageGrade:f2}.");

            totalSumOfGrades += averageGrade;


            presentation = Console.ReadLine();
        }

        Console.WriteLine($"Student's final assessment is {totalSumOfGrades/countOfPresentations:f2}.");
    }

}