#define _USE_MATH_DEFINES
#include  <cmath>
#include <cstdio>
#include <vector>
#include <iostream>
#include <algorithm>
#include <string>
#include<math.h>
#include<iomanip>
#include<stdio.h>
#include <stdlib.h>
#include<stdio.h>
#include <queue>
#include<map>
#include <sstream>
#include<set>
#include<stack>

//#include<bits/stdc++.h>


using namespace std;



int main() {
	
	int n;
	cin >> n;
	vector<int>p(n);
	for (int i = 0; i < n; i++)cin >> p[i];

	int ans = n / 2;
	if (n % 2)ans++;
	int t = 0;
	for (int i = 0; i < n; i += 2) {
		t++;
		if (i < n - 1) {
			while (p[i] == p[i + 1]) {
				t++; i++;
				if (i == n - 1)break;
			}
		}
	}
	ans = max(ans, t);
	t = 0;
	for (int i = 1; i < n; i += 2) {
		t++;
		if (i < n - 1) {
			while (p[i] == p[i + 1]) {
				t++; i++;
				if (i == n - 1)break;
			}
		}
	}

	ans = max(ans, t);
	cout << ans << endl;


	return 0;


		
}