Changing Tag Cloud widget default number value,…

Hello,
I am looking to increase the amount of tags aloud in the default wordpress tag cloud widget. I know to change the number string from 45 to 100 like I want. My problem is I cannot find where to change this. I have been looking all over for it but cannot find the location. Can someone please tell me where the string for wp_tag_cloud is located,… ?

Thanks,
~Aaron