import sys
from collections import deque

m,n = map(int,input().split())
a = input().split()

q = deque()             #实例化队列
cnt = 0
for x in a:
    if x not in q:
        if len(q) == m:
            q.popleft()   #弹出队头元素

        q.append(x)        #队列尾插入
        cnt += 1

print(cnt)