#include <iostream>
#include <fstream>
using namespace std;
ifstream f("fractal.in");
ofstream g("fractal.out");


int n,x,y;

int solve(int n, int x, int y)
{
    if(n--==0)return 0;

    int l = 1 << n;
    if(x <= l && y <= l)    return solve(n, y, x);
    if(x > l && y  <= l)    return l * l + solve(n, x - l, y);
    if(x > l && y  >  l)    return 2 * l * l+solve(n, x - l, y - l);
                            return 3 * l * l + solve(n, 2 * l - y + 1,l - x + 1);
}

int main()
{
    f>>n>>y>>x;
    g<<solve(n,x,y);
    return 0;
}