СофтУни Кемп

using System;

namespace tESt
{
    class Program
    {
        static void Main(string[] args)
        {
            var numStudents = int.Parse(Console.ReadLine());

            var car = 0;         // >= 5
            var van = 0;         // >=12
            var bus = 0;         // >=25
            var doubleBus = 0;   // >=40
            var train = 0;       // < 40

            for (int i = 0; i < numStudents; i++)
            {
                var numGroup = int.Parse(Console.ReadLine());

                if (numGroup <= 5)
                {
                    car += numGroup;
                }
                else if (numGroup <= 12)
                {
                    van += numGroup;
                }
                else if (numGroup <= 25)
                {
                    bus += numGroup;
                }
                else if (numGroup <= 40)
                {
                    doubleBus += numGroup;
                }

                else if (numGroup > 40)
                {
                    train += numGroup;
                }
            }

            double totalStudents = car + van + bus + doubleBus + train;

            var carPorcentage = (car / totalStudents) * 100;
            var vanPorcentage = van / totalStudents * 100;
            var busPorcentage = bus / totalStudents * 100;
            var doubleBusPorcentage = doubleBus / totalStudents * 100;
            var trainPorcentage = train / totalStudents * 100;

            Console.WriteLine($"{carPorcentage:f2}%");
            Console.WriteLine($"{vanPorcentage:f2}%");
            Console.WriteLine($"{busPorcentage:f2}%");
            Console.WriteLine($"{doubleBusPorcentage:f2}%");
            Console.WriteLine($"{trainPorcentage:f2}%");
        }
    }
}