A key opens a lock. Now there are 5 locks and corresponding 5 keys, but they are all messed up. How many times can you try to assign keys to all the locks?
一把钥匙开一把锁．现在有5把锁和相应的5把钥匙，但是全都放乱了，最多试多少次，可以给锁全部配好钥匙．
<gadget id="calculator">4 + 3 + 2 + 1</gadget>
<output>10</output>

<result>10</result>