#include <bits/stdc++.h>

using namespace std;

int main() {
    int n;
    cin >> n;

    string s;
    cin >> s;

    int ans = 1;

    for (int i = 0; i < n - 1; i++) {
        if (s[i] != s[i + 1]) {
            ans++;
        }
    }

    cout << ans << endl;
}