Description

An elephant is thirsty and needs to drink 20 liters of water to quench its thirst. However, it only has a small cylindrical bucket with height h centimeters and base radius r centimeters (where h and r are integers). How many buckets of water does the elephant need to drink to quench its thirst?

Input Format

A single line containing two integers separated by a space, representing the height h (1≤h≤100) and base radius r (1≤r≤100) of the bucket in centimeters.

Output Format

A single line containing an integer representing the minimum number of buckets the elephant needs to drink.
[Note]
If a cylindrical bucket has height h centimeters and base radius r centimeters, it can hold at most π×r×r×h cubic centimeters of water. (Let π=3.14159)
1 liter = 1000 milliliters; 1 milliliter = 1 cubic centimeter

Sample

23 11

3