import java.util.*;
public class rec
{
    public static void main(String[]args)
    {
        Scanner sc = new Scanner(System.in);
        int n = sc.nextInt();
        String arr[] = new String[n];
        if(n<0 || n>100)
        {
            System.out.println("Invalid input");
            return;
        }
        int count = 0;
        for(int i=1;i<n;i++)
        {
            arr[i] = sc.next();
            if(!sc.hasnext())
            {
                System.out.println("Invalid input");
            }
            if(!arr[i].equals(arr[i-1]))
            {
                count++;
            }
        }
        System.out.println(count);

        
    }
}