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

public class temp {
    public static void main(String[] args) {
        Scanner sc=new Scanner(System.in);
        int k=sc.nextInt();
        String s=sc.next();
        s+='S';
        int sea=0;
        char str[]=s.toCharArray();
        boolean valley=false;
        if(str[0]=='D')
        {valley=true;sea--;}
        else sea++;
        int count=0;
        for(int i=1;i<str.length-1;i++){
            if(sea==0 && str[i]=='D')
            { valley=true; //System.out.println("valley "+i);
            }
            if(str[i]=='U')
                sea++;
            else sea--;
            if(valley==true && sea==0){
                valley=false;
                count++;
               //System.out.println(i);

            }
           // System.out.println(sea+" "+str[i]+" "+count+" "+valley);
        }
        System.out.println(count);
    }
}