We have a rectangular parallelepiped of size A×B×C, built with blocks of size 1×1×1. Snuke will paint each of the A×B×C blocks either red or blue, so that:

• There is at least one red block and at least one blue block.
• The union of all red blocks forms a rectangular parallelepiped.
• The union of all blue blocks forms a rectangular parallelepiped.

Snuke wants to minimize the difference between the number of red blocks and the number of blue blocks. Find the minimum possible difference.

Constraints

• 2≤A,B,C≤10^9

Input

The input is given from Standard Input in the following format:

A B C

Output

Print the minimum possible difference between the number of red blocks and the number of blue blocks.

Examples

Input

3 3 3

Output

9

Input

2 2 4

Output

0

Input

5 3 5

Output

15

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