A strange grid has been recovered from an old book. It has $5$ columns and infinite number of rows. The bottom row is considered as the first row. First few rows of the grid are like this:

..............

..............

20 22 24 26 28

11 13 15 17 19

10 12 14 16 18

1 3 5 7 9

0 2 4 6 8

The grid grows upwards forever!

Your task is to find the integer in $\textbf{C}$^{th} column in $\textbf{r}$^{th} row of the grid.

Input Format

There will be two integers r and c separated by a single space.

Constraints

$1\leq r\leq2*10^9$

$1\leq c\leq5$

Rows are indexed from bottom to top and columns are indexed from left to right.

Output Format

Output the answer in a single line.

Sample Input
6 3

Sample Output
25

Explanation

The number in the 6^{th} row and 3^{rd} column is 25.

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