half4 main(float2 xy)
{
	int i;
	for (int a = 0;a < 10; ++a) for (int b = 0;b < 10; ++b) for (int c = 0;c < 10; ++c) for (int d = 0;d < 10; ++d) ++i;
	return half4(half4(0.0));
}