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

#define ll long long
#define rep(i, n) for (int i = 0; i < (n); i++)
#define P pair<int, int>
#define LP pair<ll, ll>


int main() {
  int n;
  cin >> n;
  vector<int> a(n+1);
  rep(i,n) cin >> a[i];
  a[n] = -1;
  
  vector<int> b;
  int pre = a[0];
  int cnt = 0;
  rep(i,n+1) {
    if (a[i] == pre) {
      cnt++;
    } else {
      b.push_back(cnt);
      cnt = 1;
      pre = a[i];
    }
  }
  //rep(i,b.size()) cout << b[i] << endl;
  int ans = 0;
  bool used = false;
  rep(i,b.size()) {
    if (b[i] == 1) {
      if (!used) {
        ans += 1;
        used = true;
      } else {
        used = false;
      }
    } else {
      if (!used) {
        ans += b[i];
        used = true;
      } else {
        ans += b[i]-1;
      }
    }
  }
  cout << ans << endl;

  
}