using System;

namespace Test
{
	class Program
	{
		static void Main()
		{
			int doubleSum, product;

			for(int i = 10; i < 100; i++)
			{
				doubleSum = (i / 10 + i % 10) * 2;
				product = (i / 10 * (i % 10));

				if(doubleSum == product)
				{
					Console.WriteLine(i);
				}
			}

			Console.ReadKey();
		}
	}
}