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

public class Main {

    public static void main(final String[] args) throws Exception {
        final Scanner sc = new Scanner(System.in);
        long N;
        N = sc.nextLong();
        String S;
        S = sc.next();

        final Solver solver = new Solver();
        solver.solve(N, S);
    }
}

class Solver {
    public void solve(long N, String S) {
        int ans = 1;
        char current = S.charAt(0);
        for (int i = 1; i < N; i++) {
            if (current != S.charAt(i)) {
                ans++;
                current = S.charAt(i);
            }
        }
        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