from functools import reduce
from fractions import gcd
import math
import bisect
import itertools
import sys
sys.setrecursionlimit(10**7)
input = sys.stdin.readline
INF = float("inf")


# 処理内容
def main():
    N = int(input())
    A = list(map(int, input().split()))
    
    dp = [1] * N
    for i in range(N-1):
        if A[i] == A[i+1]:
            dp[i+1] = max(dp[i+1], dp[i] + 1)
        if i+2 < N:
            dp[i+2] = max(dp[i+2], dp[i] + 1)
    
    print(dp[N-1])


if __name__ == '__main__':
    main()