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) {
        /* Enter your code here. Read input from STDIN. Print output to STDOUT. Your class should be named Solution. */
        Scanner in = new Scanner(System.in);
        int n = in.nextInt();
        String input = in.nextLine();
         input = in.nextLine();
        boolean sealevel = true;
        int stepup =0, stepdown = 0, mountain =0, valley =0;
        boolean aboveSeaLevel=false, belowSeaLevel=false;
        for (char ch: input.toCharArray()) {
          
            if(ch == 'U'){
               stepup++;
                if (sealevel){
                 sealevel=false;
                aboveSeaLevel = true;
                }
            }
             if (ch == 'D'){
               stepdown++;
                  if (sealevel){
                 sealevel=false;
                 belowSeaLevel = true;
            }
            }
            if(stepdown==stepup){
                if(belowSeaLevel) {valley++;}
                if(aboveSeaLevel) {mountain++;}
                stepup =0; stepdown = 0;
                sealevel=true;
                belowSeaLevel = false;
                aboveSeaLevel = false;
            }
            
            //System.out.println(ch+" U "+stepup+" D "+stepdown +"Valley "+valley+" Mountain "+mountain+ "abovesea "+aboveSeaLevel+" belowsea"+belowSeaLevel );
            
            
}
       System.out.println(valley);
       // System.out.println(mountain);
        
    }
}