#include <bits/stdc++.h>
using namespace std;
using ll = long long;
const int INF = 1e9 + 10;
const ll INFL = 4e18;

int main() {
    int N;
    cin >> N;
    string S;
    cin >> S;

    int ans = 0;
    int idx = 0;
    while (idx < N) {
        ans++;
        while (idx + 1 < N && S[idx] == S[idx + 1]) {
            idx++;
        }
        idx++;
    }

    cout << ans << endl;
}