Uncle Fei was carrying a briefcase with a combination lock, but he forgot the combination and only remembered that the combination was a three-digit number. The ones digit of this three-digit number is greater than the tens digit, the tens digit is greater than the hundreds digit, and there is no digit greater than 5. May I ask: How many times does Uncle Fei need to try at most to be sure that he will be able to open this briefcase?
费叔叔提着一个带密码锁的公文包，但是他忘记了密码，只记得密码是一个三位数．这个三位数的个位数比十位数字大，十位数字比百位数字大，并且没有比5大的数字．请问：费叔叔最多只需要试多少次就肯定能打开这个公文包？
<gadget id="calculator">6 + 3 + 1</gadget>
<output>10</output>

<result>10</result>