#pragma GCC optimize("03")
#include <bits/stdc++.h>
#define ll long long 

using namespace std;

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

int k, x, y;
ll pw[123];

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

    int len = pw[k - 1];
    if (x <= len && y <= len)
        return solve(k - 1, y, x);

    if (x > len && y <= len)    
        return len * len + solve(k - 1, x - len, y);
    
    if (x > len && y > len)
        return 2 * len * len + solve(k - 1, x - len, y - len);

    return 3 * len * len + solve(k - 1, 2 * len - y + 1, len - x + 1);
}

int main() {
    pw[0] = 1;
    for (int i = 1; i <= 30; i++)
        pw[i] = 2 * pw[i - 1];

    in >> k >> y >> x;
    out << solve(k, x, y);
    return 0;
}