Хистограма

using System;

namespace practice
{
    class Program
    {
        public static void Main(string[] args)
        {
            ushort countNumbers = ushort.Parse(Console.ReadLine());
            ushort sumOfAllP1 = 0;
            ushort sumOfAllP2 = 0;
            ushort sumOfAllP3 = 0;
            ushort sumOfAllP4 = 0;
            ushort sumOfAllP5 = 0;


            for (int i=0; i<countNumbers; i++)
            {
                ushort numberInput = ushort.Parse(Console.ReadLine());

                if (numberInput > 200)
                {
                    sumOfAllP1 += 1;
                }
                else if (numberInput >= 200 && numberInput < 400)
                {
                    sumOfAllP2 += 1;
                }
                else if (numberInput >= 400 && numberInput < 600)
                {
                    sumOfAllP3 += 1;
                }
                else if (numberInput >= 600 && numberInput < 800)
                {
                    sumOfAllP4 += 1;
                }
                else
                {
                    sumOfAllP5 += 1;
                }
            }

            double p1 = (sumOfAllP1 / 20 * 100);
            Console.WriteLine("P1 = {0:f2}%", p1);
            double p2 = (sumOfAllP2 / 20 * 100);
            Console.WriteLine("P2 = {0:f2}%", p2);
            double p3 = (sumOfAllP3 / 20 * 100);
            Console.WriteLine("P3 = {0:f2}%", p3);
            double p4 = (sumOfAllP4 / 20 * 100);
            Console.WriteLine("P4 = {0:f2}%", p4);
            double p5 = (sumOfAllP5 / 20 * 100);
            Console.WriteLine("P5 = {0:f2}%", p5);
                    }
    }
}