import java.io.*;
import java.util.*;

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 sc = new Scanner(System.in);
        int N = sc.nextInt();
        String hike = sc.next();
        int elevation = 0;
        int valleys = 0;
        for (int s = 0; s < hike.length(); s++) {
            if (hike.charAt(s) == 'U') {
                elevation++;
                // exiting a valley
                if (elevation == 0) {
                    valleys++;
                }
            }  else {
                elevation--;
            }
        }
        System.out.println(valleys);
        sc.close();
    }
}