import java.io.*;
import java.util.*;

public class Main {

    public static void main(String[] args) {
        //System.setIn(Main.class.getClassLoader().getResourceAsStream("input"));
        Scanner sc = new Scanner(new BufferedReader(new InputStreamReader(System.in)));
        int n = sc.nextInt();
        sc.nextLine();
        String slim  = sc.nextLine();
        int res = 1;
        for (int i = 1; i < n; i++) {
            if(slim.charAt(i) != slim.charAt(i-1)) res++;
        }
        System.out.println(res);
    }
}

/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