import java.util.List;
import java.util.Scanner;
import java.util.stream.Collectors;

public class Solution {
	public static void main(String[] args) {
		Scanner in = new Scanner(System.in);
		int steps = in.nextInt();

		List<Character> path = in.next().chars().mapToObj(e -> (char) e)
				.collect(Collectors.toList());

		int level = 0;
		int lastLevel;
		int valleys = 0;

		for (Character step : path) {
			lastLevel = level;

			if (step.equals('U')) {
				level++;
			} else {
				level--;
			}

			if (level == 0 && lastLevel < 0) {
				valleys++;
			}
		}

		System.out.println(valleys);
	}
}