題目徵集，第二輪 - Problem

#14439. 題目徵集，第二輪

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This problem is prepared by xiaowuc1 .

AI Translation — This statement was translated using AI and may contain inaccuracies. Please refer to the original statement if in doubt.

ICPC 北美資格賽 (NAQ) 的徵題活動已經結束，總共收到了若干題目。評審們對每一道題目的難度進行了投票。今年的 NAQ 將會選用一定數量的題目。NAQ 希望選出的題目能包含盡可能多種不同的難度。請計算出所能達到的最大不同難度數量。

輸入格式

輸入的第一行包含兩個整數 $n$ 和 $k$ ($1 \le k \le n \le 50$)。NAQ 將會從 $n$ 道候選題目中精確選出 $k$ 道題目。

接下來的 $n$ 行，每行包含一個整數 $d$ ($1 \le d \le 50$)，代表這 $n$ 道候選題目的難度。

輸出格式

輸出一個整數，代表 NAQ 可以選出的題目中，所能包含的最大不同難度數量。

範例

輸入 1

輸出 1

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