import java.io.*;
import java.util.*;
import java.text.*;
import java.math.*;
import java.util.regex.*;

public class Solution {

    public static void main(String[] args) {
         Scanner sc=new Scanner(System.in);
      int N=sc.nextInt();
      String a;
      String s="";
      int i=0,c=0;
       a=sc.next();
      int up=0,down=0,valley=0,mount=0;
      for(i=0;i<N;i++)
      {
          if(a.charAt(i)=='U')
              up++;
          if(a.charAt(i)=='D')
              down++;
          if(up==down)
             
          {
              s=a.substring(c,i);
               c=i+1;
              if(s.charAt(0)=='U')
                  mount++;
              else
                  valley++;
              
      }

  }
      System.out.print(valley);/* Enter your code here. Read input from STDIN. Print output to STDOUT. Your class should be named Solution. */
    }
}