19. Хистограма

using System;

namespace ConsoleApp9
{
    class Program
    {
        static void Main(string[] args)
        {
            var n = int.Parse(Console.ReadLine());

            double p1 = 0;
            double p2 = 0;
            double p3 = 0;
            double p4 = 0;
            double p5 = 0;

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

                if (number < 200)
                {
                    p1 += 1;
                }
                else if (number < 400)
                {
                    p2 += 1;
                }
                else if (number < 600)
                {
                    p3 += 1;
                }
                else if (number < 800)
                {
                    p4 += 1;
                }
                else if (number < 1000)
                {
                    p5 += 1;
                }
            }

            double p1Percent = p1 / n * 100;
            double p2Percent = p2 / n * 100;
            double p3Percent = p3 / n * 100;
            double p4Percent = p4 / n * 100;
            double p5Percent = p5 / n * 100;

            Console.WriteLine(Math.Round(p1Percent, 2) + "%");
            Console.WriteLine(Math.Round(p2Percent, 2) + "%");
            Console.WriteLine(Math.Round(p3Percent, 2) + "%");
            Console.WriteLine(Math.Round(p4Percent, 2) + "%");
            Console.WriteLine(Math.Round(p5Percent, 2) + "%");
        }
    }
}