import java.io.*;
import java.util.*;

public class Main {
    public static void main(String[] args) {
        Scanner cin = new Scanner(System.in);
        PrintWriter cout = new PrintWriter(System.out);

        int n = cin.nextInt();
        cin.nextLine();
        String s = cin.nextLine();

        int cnt = 1;
        char last = s.charAt(0);
        for(int i=1;i<n;i++) {
            char cur = s.charAt(i);
            if(last == cur) continue;
            else cnt++;
            last = cur;
        }

        cout.println(cnt);
        cout.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