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

public class Solution {

    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        int numberOfSteps = scanner.nextInt();
        String hike = scanner.next();
        scanner.close();
        int height = 0;
        int valleys = 0;
        for (int i = 0; i < numberOfSteps; i++) {
            char step = hike.charAt(i);
            if (step == 'U') {
                height++;
            } else {
                height--;
            }
            if (height == 0 && step == 'U') {
                valleys++;
            }
        }
        System.out.println(valleys);
    }
}