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CSES Problem Set

Playlist


Task | Statistics


CSES - Playlist

Time limit:1.00 s Memory limit:512 MB

You are given a playlist of a radio station since its establishment. The playlist has a total of $n$ songs.

What is the longest sequence of successive songs where each song is unique?

Input

The first input line contains an integer $n$: the number of songs.

The next line has $n$ integers $k_1,k_2,\ldots,k_n$: the id number of each song.

Output

Print the length of the longest sequence of unique songs.

Constraints
Example

Input:
8
1 2 1 3 2 7 4 2


Output:
5