Insert a future date based on a number in another cell

Hi

i'm trying to use an IF statement to insert a working day date later than today's date based on a number in another cell. For example if C2 has a number 5 in it then a date should automatically be entered, this being 5 working days from now.

here is what i have at the moment

=IF(C1:C5000="2",WORKDAY(TODAY(),2,""))*IF(C1:C5000="1",WORKDAY(TODAY(),1,""))*IF(C1:C5000="5",WORKDAY(TODAY(),,""))*IF(C1:C5000="3",WORKDAY(TODAY(),3,""))

but is does not work as i get this 00/01/1900 in each cell.

I'm new to this and i'm learning as i go along but this has me stumped!!