We define "- special" set of positive integer numbers as follows:
- each element that belongs to set must meet the restriction .
- the sum of elements of the set must be larger than .
- no pair of elements belonging to the set can be consecutive numbers.
Write a program that reads and as its input and outputs the total number of "- special" sets.
Sample Input
5 6
Sample Output
3
Explanation
Sets:
meet the given criteria. No other sets exist.
Comments