#include <cstdio>
using namespace std;

int x, y, t, k, d;

int rec( int x1, int y1, int x2, int y2 ){


    if( x1 == x2 && x2 == x && y1 == y2 && y2 == y  ) return 0;
    else{

        k--;

        d = 1 << k;
        d *= d;
        //printf("%d\n",t);

        int mid_x = ( x1 + x2 ) / 2;
        int mid_y = ( y1 + y2 ) / 2;

        if( x <= mid_x ){
            if( y <= mid_y ){
                rec( x1, y1, mid_x, mid_y );
            }
            else{
                t += d * 3;
                rec( x1, mid_y+1, mid_x, y2 );
            }
        }
        else{
            if( y <= mid_y ){
                t += d;
                rec( mid_x+1, y1, x2, mid_y );
            }
            else{
                t += d * 2;
                rec( mid_x+1, mid_y+1, x2, y2 );
            }
        }


    }



}




int main()
{

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

    int d, s;

    scanf("%d%d%d",&k,&x,&y);

    rec( 1, 1, 1 << k, 1 << k );

    printf("%d",t);

    return 0;
}