Sum and multiplication

using System;
using System.Collections.Generic;
using System.Linq;

namespace Sum
{
    class Program
    {
        static void Main(string[] args)
        {
            List<int> arr = new List<int>();
            bool check = false; ;
            int multiplicationValues = 1;
            int inputNumber = int.Parse(Console.ReadLine());
            int endDigit = inputNumber % 10;

            if (inputNumber>=100 && inputNumber<=1000)
            {
                for (int a = 1; a <= 9; a++)
                {
                    arr.Add(a);
                    for (int b = 9; b >= a; b--)
                    {
                        arr.Add(b);
                        for (int c = 0; c <= 9; c++)
                        {
                            arr.Add(c);
                            for (int d = 9; d >= c; d--)
                            {
                                arr.Add(d);
                                int sumArr = arr.Sum();

                                for (int i = 0; i < arr.Count; i++)
                                {
                                    multiplicationValues *= arr[i];
                                }
                                if (sumArr==multiplicationValues && endDigit==5)
                                {
                                    Console.WriteLine("{0}{1}{2}{3}"
                                        ,arr[0],arr[1],arr[2],arr[3]);
                                    check = true;

                                    break;
                                }
                                int result = multiplicationValues / sumArr;
                                int resultMod = inputNumber % 3;
                                if (result==3 && resultMod==0)
                                {
                                    Console.WriteLine("{0}{1}{2}{3}"
                                        ,arr[3],arr[2],arr[1],arr[0]);
                                    check = true;
                                    break;
                                }
                                if (check)
                                {
                                    break;
                                }
                                multiplicationValues = 1;
                                arr.RemoveAt(3);
                            }
                            if (check)
                            {
                                break;
                            }
                            multiplicationValues = 1;
                            arr.RemoveAt(2);
                        }
                        if (check)
                        {
                            break;
                        }
                        multiplicationValues = 1;
                        arr.RemoveAt(1);
                    }
                    if (check)
                    {
                        break;
                    }
                    multiplicationValues = 1;
                    arr.RemoveAt(0);
                }
                if (check==false)
                {
                    Console.WriteLine("Nothing found");
                }
            }
        }
    }
}