How can I use camera's look vector to get higher values while getting closer to 0?

I tried using camera's look vector to multiply a value but it didn't turn out what I expected, I wanted to have higher values while getting closer to 0 after that I wanted it to be smaller but that wasn't what it gave to me. The values of look vector is really small. I tried to add instead of multiply but I noticed that it multiplies and adds every value so I didn't know what to do. Also I'm not on computer I can't give any script, sorry.