using System;

using System.Collections.Generic;

using System.Linq;

​

public static class Kata

{

  public static int Solution(int value)

  {

      if (value < 0) { return 0; }

​

      var result = new List<int>();

      for (int i = 0; i < value; i++)

      {

        if (i % 3 == 0 || i % 5 == 0)

        {

          result.Add(i);

        }

      }

      return result.Sum(x => x);

  }

}