

import java.util.Scanner;

public class Main {

    /**
     * @param args the command line arguments
     */
    public static void main(String[] args) {
        
        Scanner s = new Scanner(System.in);
        int n = s.nextInt();
        
        String slimes = s.next();
        
        int output = 1;
        
        for (int i = 1; i < n; i ++) {
            if (slimes.charAt(i) != slimes.charAt(i - 1)) {
                output ++;
            }
        }
        
        System.out.println(output);
    }
    
}

/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