#include<iostream>
#include<string>
using namespace std;

int main() {
	int n, ans = 0;
	cin >> n;
	string s[1000];
	for (int i = 0;i<n;i++) {
		string t;
		cin >> t;
		if (s[i] != t)ans++;
	}
	cout << ans << endl;
}