# Hotel rooms

Execution time limit is 1 second

Runtime memory usage limit is 128 megabytes

A hotel has $n$ floors. The lobby, restaurant and gym are located on the first floor. The guestrooms are on $2$-nd to $n$-th floors. There are $m$ standard rooms on each floor. If each standard room can fit $3$ guests, what is the maximum number of guests that all the standard rooms can accommodate?

## Input

Two positive integers $n$ and $m(n,m≤10_{6})$.

## Output

Print the maximum number of guests that all the hotel standard rooms can accommodate.

## Examples

Input #1

Answer #1

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