#include<iostream>
#include<fstream>

using namespace std;

int k, x, y;
long pasi;
ifstream fin("fractal.in");
ofstream fout("fractal.out");

void calculeaza( int k, int x, int y )
{
	int aux;

	if ( k > 0 )
	{
		if ( ( x >= 1 && x <= 1<<(k-1) ) && ( y >= 1 && y <= 1<<(k-1) ) ) //cadran 1
			aux = x, x = y, y = aux;
		else 
			if ( ( x >= 1 && x <= 1<<(k-1) ) && ( y >= (1<<(k-1))+1 && y <= 1<<k ) ) //cadran 2
			{
				y = y - (1<<(k-1));
				pasi += 1<<(2*k-2);
			}
			else
				if ( ( x >= (1<<(k-1))+1 && x <= 1<<k ) && ( y >= (1<<(k-1))+1 && y <= 1<<k ) ) //cadran 3
				{
					x = x - (1<<(k-1));
					y = y - (1<<(k-1));
					pasi += 2 * 1<<(2*k-2);
				}
				else //cadran 4
				{
					x = x - (1<<(k-1));
					aux = x;
					x = (1<<(k-1)) - y + 1;
					y = (1<<(k-1)) - aux + 1;
					pasi += 3 * 1<<(2*k-2);
				}

		calculeaza(k-1, x, y);
	}
}

int main()
{
	fin >> k >> x >> y;
	calculeaza(k,x,y);
	fout << pasi << endl;
	return 0;
}