import java.io.*;
import java.util.*;

public class Solution {

    public static void main(String[] args) {
    
        Scanner scan=new Scanner(System.in);
         
         int i=scan.nextInt();
         
         int level=0;
         String s="";
         int valley=0;
         int prevlevel=0;
        for(int j=0;j<=i;j++)
            {
              s=scan.next();
               if(s.equals("U"))
                   level=level+1;
                if(s.equals("D"))
                    level=level-1;
           
            if(prevlevel<0 && level>=0)
            {
                valley=valley+1;
             }
            prevlevel=level;
            }
         System.out.println(valley);
    	
    }
}