import java.util.Scanner;


public class Main {
	public static void main (String args[]) throws Exception{
		Scanner scan = new Scanner(System.in);
		int n = scan.nextInt();
		String s = scan.next();
		int count = 0;

		for(int i = 0; i < n-1; i++) {
			String cur = s.substring(i, i+1);
			String next = s.substring(i+1, i+2);
			if(cur.equals(next)) {
				count++;
			}
		}
		int ans = s.length() - count;
		System.out.println(ans);
	}
}
/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