Loops - Task 8

using System;

class GCDEuclidius
{
    static void Main()
    {
        int firstN = int.Parse(Console.ReadLine());
        int secondN = int.Parse(Console.ReadLine());
        int greatestCD = 0;
        for (int i = 1; i <= Int16.MaxValue; i++)
        {
            if (firstN % i == 0 && secondN % i == 0)
            {
                greatestCD = i;
            }
            if ((i > firstN && firstN > secondN) || (i>secondN && secondN>firstN))
            {
                break;
            }
        }
        Console.WriteLine(greatestCD);
    }
}