#include <bits/stdc++.h>
using namespace std;

int hilbert (int k, int x, int y) {
    int ans = 0;
	
    for (int i = k >> 1; i; i >>= 1) {
        bool rx = x & i, ry = y & i;

        ans += i * i * ((3 * rx) ^ ry);

        if (!ry) {
			if (rx) {
				x = k - 1 - x;
				y = k - 1 - y;
			}
			
			swap(x, y);
		}
    }

    return ans;
}

int main() {
	ifstream fin("fractal.in");
	ofstream fout("fractal.out");

	int k, x, y;
	fin >> k >> x >> y;

	fout << hilbert(1 << k, x - 1, y - 1) << '\n';
}