#include <iostream>
#include <fstream>
#define ll long long
using namespace std;

ifstream f("fractal.in");
ofstream g("fractal.out");

ll fractal(int k,int x,int y)
{
    if(k==0)
        return 0;
    k--;
    ll  len=1<<k;
    if(x<=len && y<=len)///cadranul I
        return fractal(k,y,x);
    if(x<=len && y>len)/// cadranul II
        return len*len+fractal(k,x,y-len);
    if(x>len && y>len)///cadraunl III
        return 2*len*len+fractal(k,x-len,y-len);
    if(x>len && y<=len)///cadranul IV
        return 3*len*len+fractal(k,len+1-y,len+1-(x-len));
    return 0;
}
int main()
{
    int k,x,y;
    f>>k>>x>>y;
    g<<fractal(k,x,y);
}