Alice is a beginner composer and now she is ready to create another masterpiece. And not even the single one but two at the same time! Alice has a sheet with n notes written on it. She wants to take two such non-empty non-intersecting subsequences that both of them form a melody and sum of their lengths is maximal. Subsequence is a sequence that can be derived from another sequence by deleting some elements without changing the order of the remaining elements. Subsequence forms a melody when each two adjacent notes either differs by 1 or are congruent modulo 7. You should write a program which will calculate maximum sum of lengths of such two non-empty non-intersecting subsequences that both of them form a melody.
Input
The first line contains one integer number n (2≤n≤5000). The second line contains n integer numbers a1,a2,...,an (1≤ai≤105) − notes written on a sheet.
Output
Print maximum sum of lengths of such two non-empty non-intersecting subsequences that both of them form a melody.
Examples
Input
4 1 2 4 5
Output
4
Input
6 62 22 60 61 48 49
Output
5
Note
In the first example subsequences [1,2] and [4,5] give length 4 in total. In the second example subsequences [62,48,49] and [60,61] give length 5 in total. If you choose subsequence [62,61] in the first place then the second melody will have maximum length 2, that gives the result of 4, which is not maximal.