#include <cstdio>
using namespace std;

static int numar(int k, int x, int y) {
  if(1==k) {
    int a[2][2] = {{0,3}, {1, 2}};
    return a[-1+y][-1+x];
  } else {
    -- k;
    const int c2k  = 1<<k;
    const int c4k = c2k * c2k;
    if(c2k>=x) {
      if(c2k>=y) {
        return numar(k, y, x);
      } else {
        return 1 * c4k + numar(k, x, y-c2k);
      }
    } else {
      if(c2k>=y) {
        return 3 * c4k + numar(k, c2k + 1 - y, 2 * c2k + 1 - x);
      } else {
        return 2 * c4k + numar(k, x - c2k, y - c2k);
      }
    }
  }
}

int main () {
  int k, x, y;
  FILE * io;
  io=fopen("fractal.in", "r");
  fscanf(io, "%d %d %d", &k, &x, &y);
  fclose(io);
  io=fopen("fractal.out", "w");
  fprintf(io, "%d\n", numar(k, x, y));
  fclose(io);
}