def main():
    N = int(input())
    A = list(map(int, input().split()))
    dp = [0] * (N + 1)
    dp[1] = 1
    for i in range(1,N):
        if A[i-1] == A[i]:
            dp[i+1] = dp[i] + 1
        else:
            dp[i+1] = max(dp[i], dp[i-1] + 1)

    print(dp[N])




if __name__ == "__main__":
    main()