#include <fstream>
using namespace std;

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

int f(int k,int x,int y)
{
int cmp,cadran;

if(!k) return 0;

cmp=1<<k-1;

if(x<=cmp)
	if(y<=cmp)  cadran=1;
	else	cadran=2;
else
	if(y>cmp) cadran=3;
	else 	cadran=4;

switch(cadran)
{case 1: return f(k-1,y,x); break;
case 2: return cmp*cmp + f(k-1,x,y-cmp); break;
case 3: return 2*cmp*cmp + f(k-1,x-cmp,y-cmp); break;
case 4: return 3*cmp*cmp + f(k-1,cmp-y+1,2*cmp-x+1); break;}
}

int main()
{
int k,x,y;
in>>k>>x>>y;
out<<f(k,x,y);

return 0;
}