using System;
class P
{
    static void Main()
    {
        int N = Convert.ToInt32(Math.Pow(2, p() - 1));
        int X = p();
        int A = (X / p()) + 1;
        int B = ((N - 1 - X) / p()) + 1;
        Console.WriteLine(Math.Min(A,B));
        Console.ReadLine();
    }
    static int p() => int.Parse(Console.ReadLine());
}