#!/usr/bin/env python3
def main():
    # input
    n = int(input())
    a = list(map(int, input().split()))

    # solve
    dp = [0] * (n + 1)
    dp[1] = 1
    for i in range(n - 1):
        dp[i + 2] = dp[i] + 1
        if a[i] == a[i + 1]:
            dp[i + 2] = max(dp[i + 2], dp[i + 1] + 1)

    # output
    print(dp[n])

if __name__ == "__main__":
    main()