#include <iostream>
#include <vector>
#include <algorithm>
#include <cmath>
#include <fstream>

using namespace std;

ifstream fin ("fractal.in");
ofstream fout ("fractal.out");

int solve(int k,int x,int y)
{
    int d;
    if(k==0)
        return 0;
    d=(1<<(k-1));
    if(x<=d && y<=d)
        return solve(k-1,y,x);
    if(x>d && y<=d)
        return d*d+solve(k-1,x-d,y);
    if(x>d && y>d)
        return 2*d*d+solve(k-1,x-d,y-d);
    else
        return 3*d*d+solve(k-1,2*d-y+1,d-x+1);
}

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