#include <iostream>
#include <algorithm>
#include <iterator>
#include <math.h>
#include <vector>
#include <set>
#include <map>
using namespace std;
vector<long long>v;
long long n, t, x, y, z, c;
int main() {
	cin >> n;
	for (int i = 0; i < n; i++) {
		cin >> x;
		v.push_back(x);
	}
	c = 0;
	for (int i = 0; i < n - 1; i++) {
		if (v[i] != v[i + 1]) {
			c++;
			i++;
		}
	}
	cout << c;
	return 0;
}