Train the trainers

using System;

public class Program
{
	public static void Main()
	{
	   int n = int.Parse(Console.ReadLine());
		string name = Console.ReadLine();


		double gradesSum =0;
		double presentationSum =0;
		int counterPresentations =0;

		while (name!= "Finish")
		{
			for (int i=1; i<=n; i++)
			{
				double grade = double.Parse(Console.ReadLine());

				gradesSum += grade;


			}
			presentationSum += gradesSum;
			Console.WriteLine("{0} - {1:f2}.",name,gradesSum/n);
			gradesSum =0;
			counterPresentations++;
			name=Console.ReadLine();
		}
		Console.WriteLine("Student's final assessment is {0:f2}.",presentationSum/(counterPresentations*n));

	}
}