how to get Next working day formula with if function?

Hi Guys!

I am developing a work plan of field officer in which they select month and than cells will auto generate dates (with working days)

i am using this formula in B4 to get first working day

Formula:

=WORKDAY(EOMONTH(A1,-1), 1)

this works perfect but now we want that field office will re-visit after 5 days but it is difficult to get working day after 5 days in a specific cell.

i am using this formula to add 5 days

Formula:

=B4+5

this is good but it showing Sundays also.

Hope you guys understand

sorry i can not upload sample because of our Office IT restriction.

Or ...

=WORKDAY.INTL(B4,5,11)