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

public class Solution {

    public static void main(String[] args) {
        
        Scanner in=new Scanner(System.in);
        int n=Integer.parseInt(in.nextLine());
        //System.out.println(n);
        String s;
        s=in.nextLine();
        //System.out.println(s);
        int flag=0;
        int c=0;
        int count=0;
        for(int i=0;i<s.length();i++)
            {
              char ch=s.charAt(i);
              
              
              if(ch=='U')
              {
                c+=1;
                //System.out.println("ch="+ch+"  c="+c);
              }
              else
                if(ch=='D')
                {
                  c-=1;
                   //System.out.println("ch="+ch+"  c="+c);
                }
                
                
                if(c==-1)
                 {
                  flag=1;
                }
            
            
                if((c==0)&&(flag==1))
                {
                 count+=1;
                 flag=0;
                }
           
          //System.out.println(ch+"  "+c+"  "+count);   
            
        }
        
        System.out.println(count);
        }
    }