Problem Statement

You have decided to give an allowance to your child depending on the outcome of the game that he will play now.

The game is played as follows:

• There are three "integer panels", each with a digit between $1$ and $9$ (inclusive) printed on it, and one "operator panel" with a + printed on it.
• The player should construct a formula of the form $X + Y$, by arranging the four panels from left to right. (The operator panel should not be placed at either end of the formula.)
• Then, the amount of the allowance will be equal to the resulting value of the formula.

Given the values $A, B$ and $C$ printed on the integer panels used in the game, find the maximum possible amount of the allowance.

Constraints

• All values in input are integers.
• $1 \leq A, B, C \leq 9$

Input

Input is given from Standard Input in the following format:

A B C

Output

Print the maximum possible amount of the allowance.