import java.util.Scanner;

public class Main {
	
	public static void main(String[] args) {
		Main mainObj = new Main();
		mainObj.solve();
	}
	
	public void solve() {
		Scanner sc = new Scanner(System.in);
		int n = Integer.parseInt(sc.nextLine());
		String slimeSequence = sc.nextLine();
		
		sc.close();
		int numOfSlime = n;
		char beforeChar = 'A';
		
		for(int i = 0; i < n ; i++) {
			char nowChar = slimeSequence.charAt(i);
			if(nowChar == beforeChar) {
				numOfSlime--;
			}
			beforeChar = nowChar;
		}
		
		System.out.println(numOfSlime);
	}

}
/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