using System;

​

public class Program

{

    public static void Main()

    {

        int count = 0, grade = 102, count2 = 0, count3 = 0, best = 0, bad = 100;

        Console.WriteLine("several students were tested: ");

        int student = int.Parse(Console.ReadLine());

        while (count < student)

        {

            while (grade > 100 || grade < 0)

            {

                Console.WriteLine("enter a garde: ");

                grade = int.Parse(Console.ReadLine());

            }

​

            if (grade >= 55)

                count2++;

            if (grade == 100)

                count3++;

            if (grade > best)

                best = grade;

            else if (grade < bad)

                bad = grade;

            count++;

            grade = 102;

        }

​

        Console.WriteLine("pass: " + count2);

        Console.WriteLine("very good: " + count3);

        Console.WriteLine("best : " + best);

        Console.WriteLine("bad : " + bad);

    }

}