public static void main(String[] args) {
    Scanner in = new Scanner(System.in);
    int N = in.nextInt();
    String C = in.next();

    char[] arr = new char[N];
    arr = C.toCharArray();
    int count = 1;
    for(int i=0; i<N-1; i++)
    {
        if(arr[i] != arr[i+1])
            count++;

    }
    System.out.println(count);
}