import java.util.Scanner;
class Main{
public static void main(String[] args){
  Scanner sc = new Scanner(System.in);
  int n = sc.nextInt();
  int[] in = new int[n];
  String input = sc.next();
  int cnt = 0;
  for(int i = 0; i < n; i++){
    in[i] = input.charAt(i);
    if(i == 0){
      cnt++;
    }else{
      if(in[i] != in[i - 1]){
        cnt++;
      }
    }
  }
  System.out.println(cnt);
}
}
/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