If the E-value of a match is 1E-23, what is the probability of 1 or more matches this good or

better for a random query sequence?

So I did 1- e^(-1E-23)= the answer

I got zero for an answer and my teacher says "in spite of what your calculator says, the answer to is not zero."

Help?

Link to the worksheet: 2011-02-15_2205 - trinhn812's library