import java.util.*;
public class Main {
	public static void main(String[] args){
		Scanner sc = new Scanner(System.in);
		// 整数の入力
        int slime = sc.nextInt();
		String a = sc.next();
        String b[] = a.split("");
        int ans = slime;
     
        for(int i = 0; i < slime - 1;i++){
			if(b[i].equals(b[i+1])){
              ans -= 1;
            }
        }
      	System.out.println(ans);
 
    }
}
/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