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6083: 伊利亚和银行账户

内存限制：256 MB 时间限制：1 S 标准输入输出
题目类型：传统 评测方式：文本比较 上传者：
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题目描述

伊利亚是一只非常聪明的狮子，他住在一个不寻常的城市佐维尔。在这个城市里，所有的动物都有自己的权利和义务。此外，他们甚至有自己的银行账户。银行帐户的余额是整数。银行帐户的余额可以是负数。这意味着账户的所有者欠银行钱。狮子伊利亚最近过生日，所以他收到了很多礼物。其中之一（主ZooVille银行的礼物）是有机会从他的银行账户余额中删除最后一个数字或最后一个数字之前的数字不超过一次。例如，如果伊利亚的银行账户的余额是-123，那么伊利亚可以删除最后一个数字，使他的账户余额等于-12，也可以删除最后一个数字之前的数字，使账户余额等于-13。当然，伊利亚被允许不利用这个机会从平衡中删除一个数字。伊利亚不太擅长数学，这就是为什么他请你帮他最大化他的银行账户。找出使用银行礼物可以获得的银行账户的最大余额。

Ilya is a very clever lion, he lives in an unusual city ZooVille. In this city all the animals have their rights and obligations. Moreover, they even have their own bank accounts. The state of a bank account is an integer. The state of a bank account can be a negative number. This means that the owner of the account owes the bank money.
Ilya the Lion has recently had a birthday, so he got a lot of gifts. One of them (the gift of the main ZooVille bank) is the opportunity to delete the last digit or the digit before last from the state of his bank account no more than once. For example, if the state of Ilya's bank account is -123, then Ilya can delete the last digit and get his account balance equal to -12, also he can remove its digit before last and get the account balance equal to -13. Of course, Ilya is permitted not to use the opportunity to delete a digit from the balance.
Ilya is not very good at math, and that's why he asks you to help him maximize his bank account. Find the maximum state of the bank account that can be obtained using the bank's gift.
Input
The single line contains integer n (10≤|n|≤109) − the state of Ilya's bank account.
Output
In a single line print an integer − the maximum state of the bank account that Ilya can get.
Examples
Input 
2230
Output 
2230
Input 
-10
Output 
0
Input 
-100003
Output 
-10000
Note
In the first test sample Ilya doesn't profit from using the present.
In the second test sample you can delete digit 1 and get the state of the account equal to 0.

输入格式

单行包含整数n（10≤n≤10^9）——伊利亚的银行账户余额。

输出格式

在一行中输出一个整数——伊利亚可以获得的银行账户的最大状态。



Examples
Input 
2230
Output 
2230
Input 
-10
Output 
0
Input 
-100003
Output 
-10000



注：在第一个测试样本中，伊利亚并没有从使用礼物中获益。在第二个测试样本中，您可以删除数字1，并获得等于0的帐户余额。

分析：

此题就是求删除某个数字最后两位中的一位后让剩下的数最大，当然该数为正数的时候是不需要删除任何数字的，该数为负数时需要判断是删除最后一位还是倒数第二位，分别计算出这两种情况下剩下的值，比较大小即可。

输入样例 复制 

2230

输出样例 复制 

2230

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