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);
        int n = in.nextInt();
        in.nextLine();
        String str = in.nextLine();
        
        int valleys = 0;
        int lvl = 0;
        boolean below = false;
        for (String s: str.split("")){
            if(lvl < 0) {
                below = true;
            } else {
                below = false;
            }
            
            if (s.equals("U")) {
                lvl++;
            } else if (s.equals("D")) {
                lvl--;
            }
            
            if(lvl == 0 && below) {
                valleys++;
            }
            
        }
        
        
        System.out.println(valleys);
        
        
        
        
        
        
    }
}