#include <stdio.h>
#include <bits/stdc++.h>

using namespace std;

#define ll long long
#define ld long double
#define pb push_back
#define mp make_pair
#define pii pair<int, int>
#define pll pair<ll, ll>
#define pdd pair<ld, ld>
#define all(x) (x).begin(), (x).end()
#define fi first
#define se second

int Solve(int k, int x, int y) {
  if (k == 1) {
    return 0;
  }

  k /= 2;
  if (x <= k && y <= k) {
    return Solve(k, y, x);
  } else if (x <= k) {
    return k * k + Solve(k, x, y - k);
  } else if (y <= k) {
    return 3 * k * k + Solve(k, k - y + 1, 2 * k - x + 1);
  } else {
    return 2 * k * k + Solve(k, x - k, y - k);
  }
}

int main() {
  cin.sync_with_stdio(false);

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

  int k, x, y;
  cin >> k >> x >> y;
  cout << Solve(1 << k, x, y) << '\n';

  return 0;
}