So two in this case and three in this particular case. Now, how do we describe the fact that we have 16 carbons and no double bonds? Well, basically, after the name, we basically write 16 to 00:16 carbon atoms and zero double bonds. In this particular case, we have 16 of these atoms, one double bond. And so it's 16 to one in this case, it's 16 to two. We have two double bonds, and in this case, it's 16 to three because we have one, two, three of these double bonds.