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);
    }
}