import java.util.ArrayDeque;
import java.util.Deque;
import java.util.Scanner;

class Main {
    public static void main(String[] args) {
        Scanner in = new Scanner(System.in);
        int N = in.nextInt();
        String slims = in.next();
        Deque<Character> stack = new ArrayDeque<>();
        for (char c: slims.toCharArray()) {
            if (stack.isEmpty() || stack.peek() != c) {
                stack.push(c);
            }
        }
        System.out.println(stack.size());
        in.close();
    }
}
/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