#include <fstream>
#include <iostream>

using namespace std;

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

int n,x,y;
int solve(int n, int x, int y)
{
if(n==0)
    return 0;
n--;
int len= 1 << n;
if(x<=len&&y<=len)
        return solve(n,y,x);
if(x>len&&y<=len)
        return len*len+solve(n,x-len,y);
if(x>len&&y>len)
        return 2*len*len+solve(n,x-len,y-len);
return 3*len*len+solve(n,2*len-y+1,len-x+1);
 
}
int main()
{
f>>n>>y>>x;
g<<solve(n,x,y);

}