Problem:
Score : 300 points

Problem Statement

There are N integers written on a blackboard. The i-th integer is A_i.

Takahashi will repeatedly perform the following operation on these numbers:

Select a pair of integers, A_i and A_j, that have the same parity (that is, both are even or both are odd) and erase them.

Then, write a new integer on the blackboard that is equal to the sum of those integers, A_i+A_j.

Determine whether it is possible to have only one integer on the blackboard.

Constraints

2 ≦ N ≦ 10^5

1 ≦ A_i ≦ 10^9

A_i is an integer.

Input

The input is given from Standard Input in the following format:

N
A_1 A_2 … A_N

Output

If it is possible to have only one integer on the blackboard, print YES. Otherwise, print NO.

Sample Input 1

3
1 2 3

Sample Output 1

YES

It is possible to have only one integer on the blackboard, as follows:

Erase 1 and 3 from the blackboard, then write 4. Now, there are two integers on the blackboard: 2 and 4.

Erase 2 and 4 from the blackboard, then write 6. Now, there is only one integer on the blackboard: 6.

Sample Input 2

5
1 2 3 4 5

Sample Output 2

NO

Solution in C# (Mono 4.6.2.0) (judge verdict: Accepted)

using System;
using System.Linq;

//using th
//using if(from==0){};

namespace agc010_a
{
    class Program
    {
        static void Main(string[] args)
        {
           
            long kinokosuu = 0;
            long gunokosu=0;
            //long kiwomatomeyou=0;
            long s = Int64.Parse(Console.ReadLine());
            long[] a = Console.ReadLine().Split().Select(long.Parse).ToArray();
            for (long
              i = 0; i < s; i++) { if (a[i] % 2 == 0) {  gunokosu++; }
                else { kinokosuu++; }
            }
            if (kinokosuu % 2 == 0) {
              //  if (gunokosu % 2 == 0) { Console.WriteLine("Yes"); }
                Console.WriteLine("YES"); }

            else { Console.WriteLine("NO"); }

            //{ kiwomatomeyou = kinokosuu / 2; } else { kiwomatomeyou =( kinokosuu/2)+1; }
            //  if ((kiwomatomeyou + gunokosu )%2== 0)
            /*          { Console.WriteLine("Yes"); }
                  {Console.WriteLine("No"); }

                  Console.ReadLine();
             */
        }
    }
}