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) {
       int seaLevel=0, numberOfValley=0,upNumber=0,downNumber=0;
       Scanner in = new Scanner(System.in);
       int t = in.nextInt();
       String a = new String();
       a = in.next();
       boolean isValley=false;
       //System.out.println(a);
       for(int a_i=0; a_i < t; a_i++){
           if(a.charAt(a_i) == 'U'){
               upNumber+=1;
               seaLevel+=1;
           }else if(a.charAt(a_i) == 'D'){
               downNumber+=1;
               seaLevel-=1;
           }
           if(seaLevel<0)
               isValley=true;
           else 
               isValley=false; 
           
           if(seaLevel== -1 && a.charAt(a_i)=='D' && isValley) {
               numberOfValley++;
           }
       }
       
       System.out.println(numberOfValley);
   }
    
}