XORin wants to learn a new spell use it against his

**evil** enemies. Witch Ephie tells him she'll teach him a new spell and gives him

*4* numbers. XORin can learn several spells from this numbers which have different powers depending on the order of the numbers. The power of a spell can be obtained in the following way:

*a**

*b*+

*c**

*d*. Help XORin rearange the numbers so that the power of the spell is maximum.

## Input

On the first line of the input will be 4 numbers.

## Output

Print the maximum power of the spell that XORin can obtain.

## Constraints

All numbers will be greater than

**0** All numbers will be smaller than

**100**## Sample

## Note

The best arrangement we can obtain is 4*3+2*1=14