import java.io.*; import java.util.*; public class Solution { public static void main(String[] args) { Scanner get=new Scanner(System.in); int n=get.nextInt(); get.nextLine(); String a=get.nextLine(); int track=0,state=0,ans=0; for(int i=0;i<a.length();i++) { if(a.charAt(i)=='U') track++; if(a.charAt(i)=='D') track--; if(track<0) state=1; if(state==1&&track==0) { ans++; state=0; } } System.out.println(ans); } }