2017_18_March_Game Of Intervals

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace Game_Of_Intervals
{
    class Program
    {
        static void Main(string[] args)
        {
            int n = int.Parse(Console.ReadLine());
            var points = 0.0;

            var firstInterval = 0.0;
            var secondInterval = 0.0;
            var thirdInterval = 0.0;
            var forthInterval = 0.0;
            var fiftInterval = 0.0;
            var sixtInterval = 0.0;

            for (int i = 0; i < n; i++)
            {
                var nwenum = int.Parse(Console.ReadLine()); //за всеки ход на играта ще получавате по едно ново число
                if (nwenum >= 0 && nwenum <= 9)
                {
                    points += nwenum * 0.2;
                    firstInterval++;
                }
                else if (nwenum >= 10 && nwenum <= 19)
                {
                    points += nwenum * 0.3;
                    secondInterval++;
                }
                else if (nwenum >= 20 && nwenum <= 29)
                {
                    points += nwenum * 0.4;
                    thirdInterval++;
                }
                else if (nwenum >= 30 && nwenum <= 39)
                {
                    points += 50;
                    forthInterval++;
                }
                else if (nwenum >= 40 && nwenum <= 50)
                {
                    points += 100;
                    fiftInterval++;
                }
                else
                {
                    points /= 2;
                    sixtInterval++;
                }
            }

            Console.WriteLine($"{points:f2}");
            Console.WriteLine($"From 0 to 9: {firstInterval / n * 100:f2}%");
            Console.WriteLine($"From 10 to 19: {secondInterval / n * 100:f2}%");
            Console.WriteLine($"From 20 to 29: {thirdInterval / n * 100:f2}%");
            Console.WriteLine($"From 30 to 39: {forthInterval / n * 100:f2}%");
            Console.WriteLine($"From 40 to 50: {fiftInterval / n * 100:f2}%");
            Console.WriteLine($"Invalid numbers: {sixtInterval / n * 100:f2}%");
        }
    }
}