using System;
using System.Linq;

class Program
{
    static void Main(string[] args)
    {
        var line1 = Console.ReadLine();
        var values = line1.Split(" ", 2).Select(m => Convert.ToDecimal(m)).ToArray();
        var step = values[0];
        var height = values[1];

        var result = Math.Ceiling((step + 1) / height);
        Console.WriteLine(result.ToString());
    }
}