class Program
{
    int input;   // zero at start

    void main()
    {
        int result;

        if (input == 0) 
	{
	   input = 10;
	}

	if (input == 1)
	{
	   return 1;
	}

	if (input == 2)
	{
	   return 1;
	}

        input = input-1;
        result = main();

        input = input+1;
	input = input-2;
	result = result + main(); 
	input = input+2;

       
	if (input == 10)
	{
	    callout("printf","%d\n",result);
	}
        return result;
    }
}