using System.CodeDom.Compiler; using System.Collections.Generic; using System.Collections; using System.ComponentModel; using System.Diagnostics.CodeAnalysis; using System.Globalization; using System.IO; using System.Linq; using System.Reflection; using System.Runtime.Serialization; using System.Text.RegularExpressions; using System.Text; using System;

class Solution {

static int StrokesToPaint(int N,string[] C)
{
   //C = new string[N];
   int count=1;


  for(int i=0; i<=(N-1); i++)
   {
      if(i!=4)
       {
           if(C[i] != C[i+1])
           {
               count = count+1;
           }               
        }           
   }

    return count;

}

static void Main(string[] args) {

     TextWriter textWriter = new StreamWriter(@System.Environment.GetEnvironmentVariable("OUTPUT_PATH"), true);

    int N = Convert.ToInt32(Console.ReadLine());

    //string[] C = new string[N];

   string[] C = Array.ConvertAll(Console.ReadLine().Split(' '), aTemp => 
   Convert.ToString(aTemp));      

    //string C = Console.ReadLine();       

    int count=StrokesToPaint(N,C);  

    //Console.WriteLine(count);

    textWriter.WriteLine(count);

    textWriter.Flush();
    textWriter.Close();  

}
    }

}