Euler Problem1

using System;
using System.Numerics;

namespace Euler.Problems
{
    internal class Problem1
    {
        public static string[] Info()
        {
            string[] metadata =
            {
                "Multiples of 3 and 5",
                "If we list all the natural numbers below 10 that are multiples of 3 or 5, we get 3, 5, 6 and 9. The sum of these multiples is 23.\r\n\r\nFind the sum of all the multiples of 3 or 5 below 1000.",
                "1000"
            };
            return metadata;
        }
        public static BigInteger Solution(object[] args)
        {
            BigInteger
                a = 0,
                n = 0,
                i = BigInteger.Parse((string)args[0]);

            for (n = 1; n < i; n++)
            {
                if (n % 3 == 0 || n % 5 == 0)
                {
                    Console.WriteLine(DateTime.Now.ToString("[HH:mm:ss]: ") + n);
                    a = a + n;
                }
            }
            return a;
        }
        public static BigInteger GolfedSolution(object[] args)
        {
            BigInteger a = 0, n, i = BigInteger.Parse((string)args[0]);
            for (n = 1; n < i; n++)
            {
                if (n % 3 == 0 || n % 5 == 0)
                {
                    a = a + n;
                }
            }
            return a;
        }
    }
}