using System;
class P
{
    static void Main()
    {
        long N = Convert.ToInt64(Math.Pow(2, p() - 1));
        int X = p();
        int A = (X / p()) + 1;
        long B = ((N - 1 - X) / p()) + 1;
        Console.WriteLine(Math.Min(A,B));
    }
    static int p() => int.Parse(Console.ReadLine());
}