using static System.Math;
using System;

public class Hello
{
    static void Main()
    {
        var n = int.Parse(Console.ReadLine().Trim());
        string[] line = Console.ReadLine().Trim().Split(' ');
        var a = Array.ConvertAll(line, int.Parse);
        getAns(n, a);
    }
    static int calc (int n, int [] a, bool t)
    {
        var prez = t;
        var count = t ? 1 : 0;
        var pre = a[0];
        for (int i = 1; i < n; i++)
        {
            if (a[i] == pre)
            {
                count++;
                prez = true;
            }
            else
            {
                if (prez) prez = false;
                else { prez = true;  count++; }
            }
            pre = a[i];
        }
        return count;
    }
    static void getAns(int n, int[] a)
    {
        var ans = Max(calc(n, a, true), calc(n, a, false));
        Console.WriteLine(ans);
    }
}