#include <fstream>
using namespace std;
ifstream f("fractal.in");
ofstream g("fractal.out");

int k,x,y,aux,a;

int solve(int p);

int main()
{
    f>>k>>y>>x;
    g<<solve(k)<<'\n';
    f.close();
    g.close();
    return 0;
}

int solve(int p){
    if(!p)
        return 0;
    a=(1<<(p-1));
    if(x<=a){
        if(y<=a){
            aux=x;
            x=y;
            y=a-aux+1;
            return a*a-solve(p-1)-1;}
        else{
            y-=a;
            aux=x;
            x=a-y+1;
            y=aux;
            return 4*a*a-solve(p-1)-1;}}
    else{
        if(y<=a){
            x-=a;
            return a*a+solve(p-1);}
        else{
            x-=a;
            y-=a;
            return 2*a*a+solve(p-1);}}}