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