We want to solve the particular solution. Right now, we only have this constant, and we also haven't written W as a function of t just right yet. It's kind of a, they're implicitly expressed, this is more of a relationship than a function right now. So the first thing we can do is try to solve for C. We're told in the problem, we're told in the problem that W of zero is equal to, W of zero is equal to 1,400 tons. They told us that that's one of our initial conditions. So we know that the natural log, that when t is equal to zero, W is equal to 1,400. So 1,400, W is equal to 1,400, when t is equal to zero, is equal to zero plus C. Or another way to think about it is, the natural log of the absolute value of 1,100 is equal to C. And obviously this is a positive value, so we can just say that C is equal to the natural log of 1,100.