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) {
        /* Enter your code here. Read input from STDIN. Print output to STDOUT. Your class should be named Solution. */
       
        Scanner in = new Scanner(System.in);
        String n = in.next();
        String m = in.next();
        
        int height = 0;
        String heightstr = "";
        String heightstring = "";

        int count = 0;


        for (int i = 0; i < m.length(); i++) {
            if (Character.toString(m.charAt(i)).equals("U")) {
                height++;      
                if (height == 0) {
                    count++;
                }
            } else if (Character.toString(m.charAt(i)).equals("D")) {
                height--;
        }
        }
        
        System.out.println(count);
        
        
            
    }
}