/**
 * https://www.hackerrank.com/contests/rookierank/challenges/counting-valleys
 * All Contests  RookieRank  Counting Valleys
 */
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.util.StringTokenizer;

public class Solution {
	public static void main(String[] args) throws NumberFormatException, IOException {
		FasterScanner sc = new FasterScanner(System.in);
		int nNumberSteps = sc.nextInt();
		String steps = sc.nextLine();
		int currElevation = 0;
		int valleyCount = 0;
		int state = 0;

		for (int i = 0; i < nNumberSteps; i++) {
			String s = steps.substring(i, i+1);
			if (s.compareTo("U") == 0) {
				currElevation++;
			}
			else {
				currElevation--;
			}
			
			if (state >= 0 && currElevation < 0) {
				valleyCount++;
			}
			state = currElevation;
		}
		System.out.println(valleyCount);
		sc.close();
	}

	/** Buffered replacement for the java.util.Scanner */
	static class FasterScanner {
		private static BufferedReader _reader;
		private static StringTokenizer _parser;

		public FasterScanner(InputStream input) {
			_reader = new BufferedReader(new InputStreamReader(input));
			_parser = new StringTokenizer("");
		}

		/**
		 * Get the next string token from the buffer.
		 */
		public String next() throws IOException {
			while (!_parser.hasMoreTokens()) {
				_parser = new StringTokenizer(_reader.readLine());
			}
			return _parser.nextToken();
		}

		/**
		 * Get the next line of text from the buffer.
		 */
		public String nextLine() throws IOException {
			try {
				return _reader.readLine();
			} catch (IOException ex) {
				return null;
			}
		}

		/**
		 * Get the next int from the buffer.
		 */
		public int nextInt() throws NumberFormatException, IOException {
			return Integer.parseInt(next());
		}

		/**
		 * Get the next long from the buffer.
		 */
		public long nextLong() throws NumberFormatException, IOException {
			return Long.parseLong(next());
		}

		/**
		 * Close the scanner.
		 */
		public void close() throws IOException {
			_parser = null;
			if (_reader != null) {
				_reader.close();
				_reader = null;
			}
		}
	}
}