#include <bits/stdc++.h>
using namespace std;
int a[200003], n;
int main() {
  cin >> n;
  for (int i = 1; i <= n; i++) cin >> a[i];
  for (int i = 1; i < n - 1; i++) {
    if (a[i] % 2 == 0) continue;
    if (a[i + 1] > 0)
      a[i + 1]--;
    else {
      cout << "NO";
      return 0;
    }
  }
  if ((a[n - 1] + a[n]) % 2 == 0)
    cout << "YES";
  else
    cout << "NO";
  return 0;
}
