#include <iostream>
#include <stdio.h>
#include <math.h>
#include <stack>
#include <cstdlib>
#include <vector>
#include <algorithm>
#include <string.h>

using namespace std;

#define INPUT "in.txt"
#define IN "fractal.in"
#define OUT "fractal.out"

int place(int k, int x, int y) {
    int p = 1 << (k - 1);
    if (x <= p) {
        return (y <= p) ? 0 : 1;
    }
    return (y <= p) ? 3 : 2;
}

void sol() {
    int k, x, y;
    int total = 0;
    int c = -1, p, z = 0, t = 0;
    scanf("%d %d %d", &k, &x, &y);

    for (int i = k; i >= 1; i--) {
        p = 1 << i;
        if (x > p) x -= p;
        if (y > p) y -= p;
        c = place(i, x, y);
        if (z == 1) {
            if (c % 2 == 1) {
                c += 2;
                c %= 4;
            }
        }
        if (t == 1) {
            if (c % 2 == 0) {
                c += 2;
                c %= 4;
            }
        }
        if (c == 3) {
            t++;
            t %= 2;
        }
        if (c == 0) {
            z++;
            z %= 2;
        }
        total += c * (1 << (2 * i - 2));
    }

    printf("%d", total);
}

int main() {
#ifdef PADREATI
    freopen(INPUT, "r", stdin);
#else
    freopen(IN, "r", stdin);
    freopen(OUT, "w", stdout);
#endif
    sol();
    return 0;
}