using System;

namespace P05_Special_Numbers
{
    class Program
    {

        static void Main(string[] args)
        {
            //ulong n = ulong.Parse(Console.ReadLine());


            ulong Pictures = ulong.Parse(Console.ReadLine());
            ulong AmountOfTime = ulong.Parse(Console.ReadLine());
            ulong percentage = ulong.Parse(Console.ReadLine());
            ulong NeededTime = ulong.Parse(Console.ReadLine());
            decimal UsefulPicrure = Math.Ceiling(Pictures * (decimal)percentage / 100);

            //200 х 8 % / 100 =

            ulong totalTime = Pictures * (ulong)AmountOfTime + (ulong)UsefulPicrure * (ulong)NeededTime;
            string final = Convert.ToString(totalTime);

            TimeSpan t = TimeSpan.FromSeconds(Convert.ToDouble(final));

            Console.WriteLine(t.ToString(@"d\:hh\:mm\:ss"));


        }
    }
}