Exam 9. Poker Straight

namespace _4.PokerStraight
{
    using System;

    public class PokerStraight
    {
        public static void Main(string[] args)
        {
            checked
            {
                long targetW = long.Parse(Console.ReadLine());

                int countHands = 0;
                for (int f1 = 1; f1 < 11; f1++)
                {
                    for (int s1 = 1; s1 <= 4; s1++)
                    {
                        int f2 = f1 + 1;
                        for (int s2 = 1; s2 <= 4; s2++)
                        {
                            int f3 = f2 + 1;
                            for (int s3 = 1; s3 <= 4; s3++)
                            {
                                int f4 = f3 + 1;
                                for (int s4 = 1; s4 <= 4; s4++)
                                {
                                    int f5 = f4 + 1;
                                    for (int s5 = 1; s5 <= 4; s5++)
                                    {
                                        long currentWeight =
                                            ((f1 * 10) + s1) + ((f2 * 20) + s2) + ((f3 * 30) + s3) + ((f4 * 40) + s4) + ((f5 * 50) + s5);
                                        if (currentWeight == targetW)
                                        {
                                            countHands++;
                                        }
                                    }
                                }
                            }
                        }
                    }
                }

                Console.WriteLine(countHands);
            }
        }
    }
}