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

#define rep(i, n) for( int i = 0; i < n; i++ )
using ll = long long;

int main() {
	int N;
	string s;
	cin >> N >> s;
	int ans = 1;
	rep(i, N - 1) {
		if(s[i] != s[i + 1]) ans++;
	}
	cout << ans << endl;
}