#include <iostream>
#define rep(i, n) for(i = 0; i < n; i++)
using namespace std;

int n;
int a[100000];
bool used[100000];

int main() {
	int i;
	
	cin >> n;
	rep(i, n) cin >> a[i];
	
	int cnt = 0;
	used[0] = true; cnt++;
	for (i = 1; i < n; i++) {
		if (a[i - 1] == a[i]) {
			used[i] = true; cnt++;
		}
		else {
			used[i] = !used[i - 1];
			cnt += used[i];
		}
	}
	
	cout << cnt << endl;
	return 0;
}