import java.util.Scanner;

public class Solution {
    public static void main(String[] args) {
        int count = 0;
        try (Scanner scanner = new Scanner(System.in)) {
            int n = scanner.nextInt();
            int level = 0;
            scanner.nextLine();
            String s = scanner.nextLine();
            for (int i = 0; i < n; i++) {
                char c = s.charAt(i);
                boolean up = c == 'U';
                int oldLevel = level;
                level += up ? 1 : -1;
                if (oldLevel < 0 && level == 0) {
                    count++;
                }
            }
        }
        System.out.println(count);
    }
}