#include <bits/stdc++.h>
using namespace std;

void fast_io() {
    ios_base::sync_with_stdio(false);
    cin.tie(nullptr);
}

int main() {
    fast_io();
    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;
}