diplay formula result

Hi,

I have a fomula "no of days" under the Key figure structure in Bex, I want to display it as <b>0</b> if the value of this KF is negative value(eg:<0), other wise, just display whatever value it is, How can I do this? which function in Bex I should use to make it done.

let's say, if the result of fomula "no of days" is -75, then I just want to display as 0; while if the result of fomula "no of days" is 4, then just dispaly as 4.