Well, first of all, what is - so the case at II-VI is, we had a significant amount of employees worked through Chinese New Year. They were registered with the local government. This was allowed, we did that. That's why Chuck says that we have a good handle on the supply chain, because we could see the supply chain working during the Chinese New Year period. So that's the first thing.The second thing is, we have, as Chuck said, about a third of our employees back to work. So on the one hand, it's not 100%, on the other hand, it's not zero. So at this point, in our discussions with the leaders of our factories in China, looking at all the factors, looking at what's been produced, looking at January and how we think that people will gradually come back over the next several weeks, that's how we arrived at the $50 million.Now, do keep in mind we did say it was at least $50 million. And if the timeline were to go on, if there was some other extended set of national directives, yes, that number could change. But basically that's how we got there. Well, first of all, what is - so the case at II-VI is, we have a significant amount of employees work through Chinese New Year.They were registered with the local government, this was allowed, we did that. That's why Chuck says that we have a good handle on the supply chain, because we could see the supply chain working during the Chinese New Year period. So that's the first thing. The second thing is, we have, as Chuck said about a third of our employees back to work. So on the one hand, it's not 100 on the other hand, it's not zero.So at this point, with our discussions with the leaders of our factories in China. We are looking at all the factors, looking at what's been produced, looking at January and how we think that people will gradually come back over the next several weeks. That's how we arrived at the $50 million.Now, do keep in mind. We did say it was at least $50 million. And if the timeline more to go on, if there was some other extended set of national directives, yes, that number could change. But basically that's how we got there.