#include <fstream>
#include <vector>
std::ifstream cin("fractal.in");
std::ofstream cout("fractal.out");

int fractal(int k,int x,int y,int totalupto)
{
    if(k>0){
        if(x>(1<<(k-1))&&y<=(1<<(k-1)))
            return totalupto*2 + totalupto + fractal(k-1 ,(1<<(k-1))-y+1 , (1<<(k-1))-(x-(1<<(k-1)))+1,totalupto/4);
        else
            if(x>(1<<(k-1)))
                return totalupto*2 + fractal(k-1 , x-(1<<(k-1)) , y-(1<<(k-1)), totalupto/4);
        else
            if(y>(1<<(k-1)))
                return totalupto + fractal(k-1, x , y-(1<<(k-1)) , totalupto/4);
        else
            return fractal(k-1 , y , x , totalupto/4);
    }
    else
        return 0;
}

int main()
{
    int k,x,y,total=1;
    cin>>k>>x>>y;
    for(int i=1;i<k;total*=4,i++);
    cout<<fractal(k,x,y,total);
}