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) {
        Scanner sc1 = new Scanner(System.in);
        int length = sc1.nextInt();
        //System.out.println(length);
        String code = sc1.next();
        
        int counter=0;
        int counterprevious=0;
        int maxcounter=0;
        for(int i=0;i<code.length();i++)
        {
            char letter = code.charAt(i);
            
            if(letter=='U')
             {
                counterprevious=counter;
                counter++;}
            else if(letter=='D')
             {
                counterprevious=counter;
                counter--;}
            //System.out.println(counter);  
            if(counter==0 && counterprevious<0)
             {maxcounter++;}
        }
        System.out.println(maxcounter);  
    }
}