Auto calculate date

Okay I am trying to create a spreadsheet that will automatically populate some due date information. In C3 is the date received, D3 is a drop down box with the option of priority 1, priority 2, and priority 3. I need E3 to automatically populate the date it is due by based on the initial date and what s selected in D3, priority 1 needs to equal original date plus 1, priority 2 equals the original date plus 2 days, the priority 3 is plus three days, but weekend days are excluded in that calculation. I hope this makes sense

It will be priority 1, priority 2, etc

That didn't work?

Okay I tried that, and it does solve the problem of eliminating the weekends, but I only need it do that if "Priority 3" is selected in the drop down box, if it's 1 or 2 then it doesn't matter if it's a weekend or not.