import java.util.*; class Test{ public static void main(String[] args){ Scanner sc=new Scanner(System.in); int n=sc.nextInt(); String st=sc.next(); int valleys=0; int sea_level=0; for(int i=0;i<n;i++){ char cc=st.charAt(i); if(cc=='U'){ sea_level++; if(sea_level==0) valleys++; } else sea_level--; } System.out.println(valleys); } }