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

int main() {
	int n, sum = 1;
	cin >> n;
	char a[n + 1];
	for (int i = 1; i <= n; i++) {
		cin >> a[i];
		if (i != 1 && a[i] != a[i - 1])
			sum++;
	}
	cout << sum;
}