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 scan=new Scanner(System.in);
        int n=scan.nextInt();
        String ip=scan.next();
	
        int atSeaLevel=1,climbing=0,drowning=0,nod=0,nou=0;
        int res=0;
        for(int i=0;i<ip.length();i++){
            
            char step=ip.charAt(i);
            if(step == 'U' && atSeaLevel == 1){
                climbing=1;
                atSeaLevel=0;
                nou=1;
                nod=0;
                
            }
             
            else if(step == 'D' && atSeaLevel == 1){
                drowning=1;
                atSeaLevel=0;
                nod=1;
                nou=0;
                res++;
                
                
            }
            
            
            else{
                
                if(step == 'D')
                    nod++;
                
                if(step == 'U')
                    nou++;
                if(nod==nou){
                       
                atSeaLevel=1;
                    
                }
            }
            
            
            
            
        }
        System.out.println(res);
        
        
    }
}