"""

https://yukicoder.me/problems/no/365

"""

import bisect

def LIS(lis):

    seq = []

    for c in lis:
        ind = bisect.bisect_left(seq,c)

        if ind == len(seq):
            seq.append(c)
        else:
            seq[ind] = c

    return len(seq)


N = int(input())
A = list(map(int,input().split()))
print (N - LIS([-A[i] for i in range(N-1,-1,-1)]) )