import java.util.*;

class Main {
	public static void main(String[] args) {
      Scanner sc = new Scanner(System.in);
      int N = Integer.parseInt(sc.next());
      String S = sc.next();
      
      char[] ch = S.toCharArray();
      
      int result = 1;
      
      for (int i = 1; i < N; ++i) {
        if (ch[i - 1] != ch[i]) result++;
      }
      
      
      System.out.println(result);
    }

}
/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