def page_replaced(l,k,pages):
    cache = []
    missed_count = 0
    for page in pages:
        if page not in cache:
            missed_count += 1
            if l == len(cache):
                cache.pop(0)
            cache.append(page)
    return missed_count

l,k = map(int,input().strip().split(" "))
pages = list(map(int,input().strip().split(" ")))

print(page_replaced(l,k,pages))