import java.util.*;

import java.io.*;
import java.nio.charset.StandardCharsets;

public class Main {
	public static void main(String[] args) throws IOException {
		InputStreamReader reader = new InputStreamReader(System.in, StandardCharsets.UTF_8);
		BufferedReader in = new BufferedReader(reader);
		int N = Integer.parseInt(in.readLine());
		char[] S = in.readLine().toCharArray();
		Deque<Character> deque = new ArrayDeque<>();
		deque.addLast(S[0]);
		for (int i = 1; i < N; ++i) {
			if (S[i] != deque.getLast()) {
				deque.addLast(S[i]);
			}
		}
		System.out.println(deque.size());
	}
}

/tmp/hf-datasets-cache/medium/datasets/42704881117311-config-parquet-and-info-qiankunmu-Project_CodeNet-896c9d36/hub/datasets--qiankunmu--Project_CodeNet_Python800_and_Java250/snapshots/c899fde44a77ba1cc14973ed3de064e4ff3aadc7/Project_CodeNet_Java250.tar.gz