Ilya and Bank Account

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在城市ZooVille中，每只动物都有自己的银行账户。Ilya收到了一个特殊的生日礼物，可以从他的账户余额中删除倒数第一个或第二个数字。本篇介绍如何利用这个机会最大化账户余额。

Description

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.

Sample Input

Input

Output

Input

-10

Output

Input

-100003

Output

-10000

Hint

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.

#include <iostream>

using namespace std;

int main(){
    int a,b1,b2,t;
    while(cin>>a){
        b1=a/10;
        b2=(a/100)*10+a%10;
        t=max(max(b1,b2),a);
        cout<<t<<endl;
    }
    return 0;
}