Well, calculators don't have a negative infinity button, but you could put in a very, very, very, very negative number that, for our purposes, is equivalent to negative infinity. So we could say negative one times 10 to the 99th power. And the way we do that is second, this two capital Es are saying, essentially times 10 to the, and I'll say 99th power. So this is a very, very, very negative number. The upper bound here, we want to go, let me delete this. The upper bound is going to be zero. We're finding the area from negative infinity all the way to zero.