import java.util.Scanner;
public class Main {
	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		int N = sc.nextInt();
		String str = sc.next();
		char check, bCheck;
		int Count = 0;
		bCheck = str.charAt(0);
		for(int i = 1; i < N; i++) {
			check = str.charAt(i);
			if(check != bCheck) {
				Count++;
			}
			bCheck = check;
		}
		System.out.println(Count+1);
	}
}
/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