#include <bits/stdc++.h>
#define rep(i,n) for(int i=0;i<(n);++i)
#define all(a) (a).begin(),(a).end()
using namespace std;
typedef long long ll;

int main() {
	ios::sync_with_stdio(false);
	cin.tie(0);
	int n;
	cin >> n;
	vector<int> A(n);
	rep(i, n) cin >> A[i];
	vector<int> dp(n + 1 , 0);
	dp[0] = 0;
	dp[1] = 1;
	bool elf = false;
	for (int i = 1; i < n; ++i) {
		if (A[i] == A[i - 1]) {
			dp[i + 1] = dp[i] + 1;
			elf = false;
		}
		else {
			if (!elf) {
				dp[i + 1] = dp[i];
				elf = true;
			}
			else {
				dp[i + 1] = dp[i] + 1;
				elf = false;
			}
		}
	}
	cout << dp[n] << endl;
	return 0;
}