import sys; input = sys.stdin.buffer.readline
sys.setrecursionlimit(10**7)
from collections import defaultdict
con = 10 ** 9 + 7; INF = float("inf")

def getlist():
	return list(map(int, input().split()))

#処理内容
def main():
	N = int(input())
	A = getlist()
	# 0:餅 1:ずんだ餅
	DP = [[0, 0] for i in range(N)]
	DP[0][1] = 1
	for i in range(1, N):
		DP[i][0] = max(DP[i - 1][0], DP[i - 1][1])
		DP[i][1] = DP[i - 1][0] + 1
		if A[i] == A[i - 1]:
			DP[i][1] = max(DP[i][1], DP[i - 1][1] + 1)

	# print(DP)
	print(max(DP[-1][0], DP[-1][1]))




if __name__ == '__main__':
	main()