#include <iostream>
#include <algorithm>
#include <fstream>
#include <string>

using namespace std;

#define FILE_IN "fractal.in"
#define FILE_OUT "fractal.out"

int K, X, Y;

int F(int x, int y, int k)
{
	if (!k) return 0;

	int L = 1<<k;

	if (x>=L/2) return L*L-1 - F(L-1-x, y, k);
	if (y<L/2) return L*L/4-1 - F(L/2-1-y, x, k-1);

	return L*L/4 + F(x, y-L/2, k-1);
}

int main()
{
	ifstream fisIn(FILE_IN);
	ofstream fisOut(FILE_OUT);
	
	fisIn >> K >> X >> Y;

	fisOut << F(X-1,Y-1,K);
}