#include <cstdio>
#include <cstdint>
#include <algorithm>
using namespace std;

int main(int argc, char *argv[])
{
    freopen("fractal.in", "r", stdin);
    freopen("fractal.out", "w", stdout);
    int a, s = 0, a2;
    int k, x, y, cx;
    scanf("%d%d%d", &k, &y, &x);
    a = 1 << k;
    while (k) {
        a2 = a / 2;
        if (x > a2 && y > a2) {
            x -= a2;
            y -= a2;
            s += 2 * (1 << (k - 1) * 2);
        }
        else if (x <= a2 && y <= a2)
            swap(x, y);
        else if (x > a2 && y <= a2) {
            x -= a2;
            s += 1 << (k - 1) * 2;
        }
        else if (x <= a2 && y > a2) {
            cx = x;
            x = a - y + 1;
            y = a2 - cx + 1;
            s += 3 * (1 << (k - 1) * 2);
        }
        a >>= 1;
        k--;
    }
    printf("%d\n", s);
    return 0;
}