#include <fstream>
#include <queue>
#include <cmath>
using namespace std;

ifstream fi("fractal.in");
ofstream fo("fractal.out");

int n,m,k,i,j,s,x,y,row;
bool a[50][50];

int fractal(int k,int x,int y){
    if(k==1)return 0;
    k/=2;
    if(x<=k&&y<=k){
        return fractal(k,y,x);
    }
    if(x<=k)
        return k*k+fractal(k,x,y-k);
    if(y<=k)
        return k*k*3+fractal(k,k+1-y,k+1-(x-k));
    return k*k*2+fractal(k,x-k,y-k);


}


int main()
{
  fi>>k>>x>>y;
  fo<<fractal(1<<k,x,y);




    return 0;
}