#include <bits/stdc++.h>
const double g = 9.8;
using namespace std;
const long long mod = 998244353;
long long quick(long long prea, long long bbb) {
  long long res = 1;
  while (bbb) {
    if (bbb & 1) res = res * prea % mod;
    prea = prea * prea % mod;
    bbb >>= 1;
  }
  return res;
}
long long gcd(long long a, long long b) { return b == 0 ? a : gcd(b, a % b); }
pair<int, int> pp;
const int w = 2e5 + 5;
long long a[w];
stack<long long> s;
int main() {
  long long k, m, n, t, i, j;
  cin >> n;
  for (i = 0; i < n; i++) {
    cin >> m;
    if (s.empty())
      s.push(m);
    else {
      if (abs(m - s.top()) % 2 == 0)
        s.pop();
      else
        s.push(m);
    }
  }
  if (s.size() > 1)
    cout << "NO" << endl;
  else
    cout << "YES" << endl;
  return 0;
}
