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#include <fstream>
using namespace std;
ifstream fin("fractal.in");
ofstream fout("fractal.out");
int k,x,y;
int fractal( int k , int x , int y )
{
int m = 1 << ( k - 1 );
if( k == 1 )
{
if( x == 1 && y == 1 )
return 0;
if( x == 1 && y == 2 )
return 1;
if( x == 2 && y == 2 )
return 2;
else
return 3;
}
if( x <= m && y <= m )
return fractal( k - 1 , y , x );
else if( x > m && y <= m )
return fractal( k - 1 , m + 1 - y , m + 1 - ( x - m ) ) + m * m * 3;
else if( x <= m && y > m )
return fractal( k - 1 , x , y - m ) + m * m;
else if( x > m && y > m )
return fractal( k - 1 , x - m , y - m ) + m * m * 2;
}
int main()
{
fin>>k>>x>>y;
fout<<fractal( k , x , y );
return 0;
}