#include <cstdio>

int f(int put, int x, int y) {
    if (put == 0)
        return 0;
    bool stanga = (x <= put), jos = (y > put);
    int c = 0;
    if (stanga && jos)
        c = 1;
    if (!stanga && jos)
        c = 2;
    if (!stanga && !jos)
        c = 3;

    if (c == 0) {
        int aux = x;
        x = y;
        y = aux;
    }
    if (c == 3) {
        x = (x - 1) % put + 1;
        int aux = x;
        x = put + 1 - y;
        y = put +1 - aux;
    }
    if (c == 1)
        y = (y - 1) % put + 1;
    if (c == 2) {
        x = (x - 1) % put + 1;
        y = (y - 1) % put + 1;
    }
    return c * put * put + f(put / 2, x, y);
}

int main() {
    FILE* fi = fopen("fractal.in", "rt");
    FILE* fo = fopen("fractal.out", "wt");

    int k, x, y;
    fscanf(fi, "%d%d%d", &k, &x, &y);
    int put = 1;
    for (int i = 1; i < k; i++)
        put *= 2;

    fprintf(fo, "%d", f(put, x, y));

    return 0;
}