#include <bits/stdc++.h>
using namespace std;
const int LEN = 100009;
int n;
int a[LEN];
int ch = 0, nech = 0;
int ans = 0;
int main() {
  cin >> n;
  for (int i = 0; i < n; i++) cin >> a[i];
  for (int i = 0; i < n; i++) {
    if (a[i] % 2 == 0)
      ch++;
    else
      nech++;
  }
  ans = min(ch, nech);
  while (nech > 1) {
    nech -= 2;
    ch++;
    ans = max(ans, min(ch, nech));
  }
  cout << ans;
  return 0;
}
