SinoTheWalkerWorking

using System;
using System.Globalization;
using System.Numerics;

namespace SinoTheWalker
{
    class MainClass
    {
        public static void Main(string[] args)
        {
            string leaveTime = Console.ReadLine();
            DateTime leave = DateTime.ParseExact(leaveTime, "HH:mm:ss", CultureInfo.InvariantCulture);
            decimal steps = decimal.Parse(Console.ReadLine());
            decimal timePerStep = decimal.Parse(Console.ReadLine());

            BigInteger seconds = ((BigInteger)(steps * timePerStep))%86400;
            leave = leave.AddSeconds((int)seconds);
            Console.WriteLine($"Time Arrival: {leave:HH:mm:ss}");
        }
    }
}