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Points:
10 (partial)

Time limit:
1.0s

Memory limit:
16M

Problem type

Allowed languages

Assembly, Brain****, C, C++, COBOL, Forth, Fortran, Java, Lua, Prolog, Text, Turing

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.

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