P1747 A Very Strange Game

"The Story of Love and Sorrow III · shopping", entertainment chapter. Let’s change the pace with an easy problem.

Aiyuchou dashen was bored on the bus and started playing on the phone. A strange game caught Aiyuchou dashen’s eye: *** (the game’s name is mosaicked). The game is similar to chess, but there is only one black knight and one white knight, located at points $x_1, y_1$ and $x_2, y_2$. They must move from $x_1, y_1$ and $x_2, y_2$ to $(1, 1)$. This game differs from ordinary chess in that a knight can move in an L shape (“ma”) and can also move like an “elephant” (“xiang”) in Chinese chess, i.e., two squares diagonally. Note that you cannot move to any position where the $x$ or $y$ coordinate satisfies $\le 0$. Any $(x, y)$ that satisfies this constraint is reachable.

The first line contains two integers $x_1, y_1$. The second line contains two integers $x_2, y_2$.

The first line contains one integer, the number of steps for the black knight to reach $(1, 1)$. The second line contains one integer, the number of steps for the white knight to reach $(1, 1)$.

### Constraints For $100\%$ of the testdata, $1 \le x_1, y_1, x_2, y_2 \le 20$. Translated by ChatGPT 5