Problem: <image>

Input

The input contains two integers a1, a2 (0 ≤ ai ≤ 32), separated by a single space.

Output

Output a single integer.

Examples

Input

1 1


Output

0


Input

3 7


Output

0


Input

13 10


Output

1

Solution (in CPP):

Solution:
#include <bits/stdc++.h>
using namespace std;
void dfs(int a, int b, int &x, int &y) {
  if (a == 1) {
    if (b == 0)
      x = 0, y = 0;
    else if (b == 1)
      x = 1, y = 0;
    else if (b == 2)
      x = 1, y = 1;
    else
      x = 0, y = 1;
    return;
  }
  int len = 1 << a - 1, num = 1 << 2 * (a - 1), x0, y0;
  dfs(a - 1, b % num, x0, y0);
  if (a & 1) {
    if (b / num == 0)
      x = x0, y = y0;
    else if (b / num == 1)
      x = len + y0, y = x0;
    else if (b / num == 2)
      x = len + y0, y = len + x0;
    else
      x = len - x0 - 1, y = 2 * len - y0 - 1;
    return;
  }
  if (b / num == 0)
    x = x0, y = y0;
  else if (b / num == 1)
    x = y0, y = len + x0;
  else if (b / num == 2)
    x = len + y0, y = len + x0;
  else
    x = 2 * len - x0 - 1, y = len - y0 - 1;
}
int main() {
  int a, b;
  scanf("%d%d", &a, &b);
  int x, y;
  dfs(a, b, x, y);
  if (a & 1) swap(x, y);
  printf("%d %d\n", x, y);
  return (0);
}