Your mother has sent you to the milkman with a cylindrical bottle. You have to pay the milkman the price for the bottle full of milk at a rate of ₹40 per litre of milk. You are given the radius (r) and the height (h) of the bottle in centimetres. You can assume the value of π as 3.14.

Formula for volume of cylinder:

V=π r²h

Also, 1 litre = 1000 cm³.

Input Format

1 line containing two space separated integers - the radius and the height of the bottle (in centimetres).

Output Format

The amount you need to pay to the milkman in rupees, accurate upto exactly 2 decimal places.

Examples

Sample Input

5 24

Expected Output

75.36

Constraints

0 < r <=1000
0 < h <=1000