#include <fstream>


const char IN [ ] = "fractal.in" ;
const char OUT [ ] = "fractal.out" ;

using namespace std;

ifstream fin ( IN ) ;
ofstream fout ( OUT ) ;

inline int arie ( int x )
{
    return x * x ;
}
int fractal  ( int x , int y , int ordin )
{
    if ( ordin < 0 )
        return 0 ;
    int lung = 1 << ordin ;
    if ( x <= lung and y <= lung )
        return fractal ( y , x , ordin - 1 ) ;
    else if ( x > lung and y <= lung )
        return arie ( lung ) + fractal  ( x - lung , y , ordin - 1 ) ;
    else if ( x > lung and y > lung )
        return 2 * arie ( lung ) + fractal ( x - lung ,  y - lung , ordin - 1 ) ;
    else
        return  3 * arie ( lung ) + fractal  ( ( lung << 1 ) - y + 1 , lung - x + 1 ,  ordin - 1 ) ;
}

int main()
{
    int ordin, x , y ;
    fin >> ordin >> x >> y ;
    fout << fractal ( x , y , ordin ) ;
    return 0;
}