using System;
using System.Linq;

namespace yukicoder
{
    class Program
    {

        static void Main(string[] args)
        {
            long W = int.Parse(Console.ReadLine());
            long D = int.Parse(Console.ReadLine());
            int[] chk = new int[D];
            
            long remainingDay = D;
            long remainingWork = W;
            
            for(int i = 0;i < D;i++)
            {
              int todayWork = (int)(remainingWork / (remainingDay * remainingDay));
              chk[i] = todayWork;
              
              --remainingDay;
              remainingWork -= todayWork;
              
            }
            Console.WriteLine(chk[D-1]);
        }
    }
}