using System;

namespace Train_The_Trainers
{
    class Program
    {
        static void Main(string[] args)
        {
            int numberOfPeople = int.Parse(Console.ReadLine());
            string nameOfPresentation = Console.ReadLine();

            double totalGrades = 0;
            double totalCounter = 0;

            while (nameOfPresentation != "Finish")
            {
                double sumOfGrades = 0;
                double counter = 0;

                for (int i = 0; i < numberOfPeople; i++)
                {
                    double grade = double.Parse(Console.ReadLine());

                    sumOfGrades += grade;
                    counter++;
                }
                Console.WriteLine($"{nameOfPresentation} - {sumOfGrades/counter:F2}.");

                nameOfPresentation = Console.ReadLine();
                totalGrades += sumOfGrades;
                totalCounter += counter;
            }
            if (nameOfPresentation == "Finish")
            {
                Console.WriteLine($"Student's final assessment is {totalGrades / totalCounter:F2}.");
            }
        }
    }
}