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#include <fstream>
using namespace std;
ifstream fin("fractal.in");
ofstream fout("fractal.out");
int n,x,y,aux,sol,dim,cnt;
void love(int i, int j){
if(dim!=1){
dim/=2;
if(i<=dim){
if(j>dim){
sol+=3*dim*dim;
love(2*dim+1-j,dim+1-i);
}else{
love(j,i);
}
}else{
if(j<=dim){
sol+=dim*dim;
love(i-dim,j);
}else{
sol+=2*dim*dim;
love(i-dim,j-dim);
}
}
}
}
int main(){
fin>>n>>y>>x;
dim=(1<<n);
love(x,y);
fout<<sol;
return 0;
}