//Testcase
static void Main(string[] args)
{
Solution sol = new Solution();
int stone_num = new Random().Next(1, 1001);
if (sol.CanWinNim(stone_num))
{
Console.WriteLine("When the number of stones are " + stone_num + ", first win!");
}
else
{
Console.WriteLine("When the number of stones are " + stone_num + ", second win!");
}
}