int curious_fraction(int a, int b)
{
	int a1 = a/10;
	int a2 = a%10;
	int b1 = b/10;
	int b2 = b%10;

	float result = 1.0*a/b;

	if(a2 == 0)
		return 0;

	if(a1 == b1)
	{
		float result2 = 1.0*a2/b2;
		if(result == result2)
			return 1;
	}

	if(a1 == b2)
	{
		float result2 = 1.0*a2/b1;
		if(result == result2)
			return 1;
	}
	
	if(a2 == b1)
	{
		float result2 = 1.0*a1/b2;
		if(result == result2)
			return 1;
	}
	
	if(a2 == b2)
	{
		float result2 = 1.0*a1/b1;
		if(result == result2)
			return 1;
	}
	
	return 0;
}

int main()
{
	int a, b;
	float product = 1.0;

	for(a=10; a<100; a++)
		for(b=a+1; b<100; b++)
			if(curious_fraction(a, b))
				product *= 1.0*a/b;
	
	printf("%d\n", (int)(1/product));

	return 0;
}