Virtual contest is a way to take part in past contest, as close as possible to participation on time. It is supported only ACM-ICPC mode for virtual contests.
If you've seen these problems, a virtual contest is not for you - solve these problems in the archive.
If you just want to solve some problem from a contest, a virtual contest is not for you - solve this problem in the archive.
Never use someone else's code, read the tutorials or communicate with other person during a virtual contest.

No tag edit access

E. Vladik and cards

time limit per test

2 secondsmemory limit per test

256 megabytesinput

standard inputoutput

standard outputVladik was bored on his way home and decided to play the following game. He took *n* cards and put them in a row in front of himself. Every card has a positive integer number not exceeding 8 written on it. He decided to find the longest subsequence of cards which satisfies the following conditions:

- the number of occurrences of each number from 1 to 8 in the subsequence doesn't differ by more then 1 from the number of occurrences of any other number. Formally, if there are
*c*_{k}cards with number*k*on them in the subsequence, than for all pairs of integers the condition |*c*_{i}-*c*_{j}| ≤ 1 must hold. - if there is at least one card with number
*x*on it in the subsequence, then all cards with number*x*in this subsequence must form a continuous segment in it (but not necessarily a continuous segment in the original sequence). For example, the subsequence [1, 1, 2, 2] satisfies this condition while the subsequence [1, 2, 2, 1] doesn't. Note that [1, 1, 2, 2] doesn't satisfy the first condition.

Please help Vladik to find the length of the longest subsequence that satisfies both conditions.

Input

The first line contains single integer *n* (1 ≤ *n* ≤ 1000) — the number of cards in Vladik's sequence.

The second line contains the sequence of *n* positive integers not exceeding 8 — the description of Vladik's sequence.

Output

Print single integer — the length of the longest subsequence of Vladik's sequence that satisfies both conditions.

Examples

Input

3

1 1 1

Output

1

Input

8

8 7 6 5 4 3 2 1

Output

8

Input

24

1 8 1 2 8 2 3 8 3 4 8 4 5 8 5 6 8 6 7 8 7 8 8 8

Output

17

Note

In the first sample all the numbers written on the cards are equal, so you can't take more than one card, otherwise you'll violate the first condition.

Codeforces (c) Copyright 2010-2019 Mike Mirzayanov

The only programming contests Web 2.0 platform

Server time: Mar/19/2019 23:10:43 (d2).

Desktop version, switch to mobile version.

Supported by

User lists

Name |
---|