#include <bits/stdc++.h>

using namespace std;

#define REP(i,a,b) for(int i=a;i<(int)b;i++)
#define rep(i,n) REP(i,0,n)
typedef long long ll;
int main() {
  int N; cin >> N;
  int ans = 0;
  vector<int> v(N);
  rep(i, N) {
    ll x; cin >> x; x+=10000000000;
    ans -= x%2;
    ans += !(x%2);
  }
  
  cout << ans << endl;
  
  return 0;
}