#include <iostream>

#include <fstream>

using namespace std;

signed main() {

try {

 ifstream f;

 int _sum = 0, n, x;

 f.open("name.txt");

 f >> n;

 while (!f.eof()) {

  int i = 0;

  f >> x;

  _sum += x;

  i++;

 }

 if (_sum % 2 == 0)

  cout << "YES";

 else

  cout << "NO";

}

catch (...) {

 cout << "Error!";

}

return 0;

}