An urn contains 8 balls : 4 red , 2 blue and 2 green. Now n balls are drawn out of the urn. Calculate the probability that out of n drawn balls exactly x balls are red. Find your answer multiplied by 100 and return the integer part. All required values for computation will be in integer range.
Input Format
Two spaced integers : n and x
Output Format
Integer part of (Probability * 100)
Constraints
x is always less than equal to 4 and x is always less than equal to n.
Example
Input
3 1
Output
42