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

namespace Otosidama
{
    class Program
    {
        static void Main(string[] args)
        {
            var str0 = decimal.Parse(Console.ReadLine());
            var str1 = decimal.Parse(Console.ReadLine());
            var temp = (int)(str0 / 1000);
            var temp2 = (int)(temp / str1)*1000;
            Console.WriteLine(temp2);
        }
    }
}