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

int main() {
    int n;
    string s;
    cin >> n >> s;
    int cnt = 0;
    for (int i = 0; i < n - 1; i++) {
        if (s[i] != s[i + 1]) {
            cnt++;
        }
    }
    cout << cnt + 1 << endl;
}