using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace Thea_The_Photographer
{
    class Program
    {
        static void Main(string[] args)
        {
            var picturesCount = int.Parse(Console.ReadLine());
            var filterTime = int.Parse(Console.ReadLine());
            var filterPercentage = int.Parse(Console.ReadLine());
            var upoadTime = int.Parse(Console.ReadLine());

            var totalFilterTime = picturesCount * filterTime;

            var goodPictures = (int)(Math.Ceiling(picturesCount * ((double)filterPercentage / 100)));

            var uploadSeconds = goodPictures * upoadTime;

            var totalSeconds = totalFilterTime + uploadSeconds;

            var totalTime = new TimeSpan(0, 0, totalSeconds);

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

        }
    }
}