Problem Statement

There are $N$ candies arranged in a row from left to right.
Each of these candies has one color that is one of the 10^9109 colors called Color $1$, Color $2$, $\dots$, and Color 10^9109.
For each $i=1,2,\dots ,N$, the color of the $i$-th candy from the left is Color c_ici.
From this row, Takahashi can choose $K$ consecutive candies and get them.
That is, he can choose an integer $i$ such that $1\le i\le N-K+1$ and get the $i$-th, $(i+1)$-th, $(i+2)$-th, $\dots$, $(i+K-1)$-th candy from the left.
Takahashi likes to eat colorful candies, so the more variety of colors his candies have, the happier he will be.
Print the maximum possible number of distinct colors in candies he gets.

Constraints

• 1 \leq K \leq N \leq 3 \times 10^51≤K≤N≤3×105
• 1 \leq c_i \leq 10^91≤ci≤109
• All values in input are integers.

$N$$K$c_1c1c_2c2$\dots$c_NcN