#include <bits/stdc++.h>
using namespace std;
int main() {
  bool discount_flag = true;
  int num_of_session;
  cin >> num_of_session;
  vector<int> num_of_teams(200001);
  for (int i = 0; i < num_of_session; i++) cin >> num_of_teams[i];
  for (int i = 0; i < num_of_session; i++)
    if (num_of_teams[i] % 2 == 1)
      if (i != num_of_session - 1 and num_of_teams[i + 1] > 0) {
        num_of_teams[i + 1] -= 1;
        num_of_teams[i] = 0;
      } else if (num_of_teams[i + 1] == 0)
        discount_flag = false;
      else if (i == num_of_session)
        discount_flag = false;
  if (discount_flag)
    cout << "YES" << endl;
  else
    cout << "NO" << endl;
  return 0;
}
