#include<stdio.h>

int K, xx, yy, rez = 0;

inline void Steps( int Ord, int X, int Y )
{
	if( Ord > 0 )
	{
		int L = 1<<(Ord-1) ;

		if( Y <= Ord && X <= Ord ) Steps( Ord-1, Y, X );
		else if( Y <= Ord && X > Ord ) { rez += L*L; Steps( Ord-1, X-L, Y ); }
		else if( Y > Ord && X > Ord ) { rez += 2*L*L; Steps( Ord-1, X-L, Y-L ); }
		else if( Y > Ord && X <= Ord ) { rez += 3*L*L; Steps( Ord-1, 2*L-Y+1, L-X+1 ); }
	}
}

int main()
{
	freopen("fractal.in","r",stdin);
	freopen("fractal.out","w",stdout);

	scanf("%d%d%d", &K, &xx, &yy);
	Steps( K, yy, xx );

	printf("%d\n", rez);

	return 0;
}