import sys
def input(): return sys.stdin.readline().strip()
def mapint(): return map(int, input().split())
sys.setrecursionlimit(10**9)

N = int(input())
As = list(mapint())
from bisect import bisect_left

def LIS(in_lis):
    lis = []
    ret_lis = [1]*len(in_lis)
    for i in range(N):
        a = in_lis[i]
        idx = bisect_left(lis, a)
        if idx>=len(lis):
            lis.append(a)
            ret_lis[i] = len(lis)
        elif lis[idx]==a:
            ret_lis[i] = len(lis)
        else:
            lis[idx] = a
    return ret_lis

ascending = LIS(As)
decending = LIS([-a for a in As])
r_ascending = LIS(As[::-1])[::-1]
r_decending = LIS([-a for a in As[::-1]])[::-1]
ans = 0
for n, r in zip(ascending, r_ascending):
    ans = max(ans, min(n, r))
for n, r in zip(decending, r_decending):
    ans = max(ans, min(n, r))
print(ans-1)