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. */
        int alt = 0;
        int count = 0;
        
        Scanner in = new Scanner(System.in);
        int n = Integer.parseInt(in.nextLine());
        String a = in.nextLine();
        
        for (int i = 0; i < n; i++) {
            if (a.substring(i, i+1).equals("D")) {
                alt--;
            } else {
                alt++;
            }
            if (alt == 0 && a.substring(i, i+1).equals("U")) {
                count++;
            }
        }
        
        System.out.println(count);
        
    }
}