Adding total damage rolls of multiple attacks in 1 box

So let's say im doing a multi attack of 5 hits (which I have a macro for).. Now my GM tells me, of those 5 attacks, 3 landed.

I want a macro where I can simply click on it, and input "3" which is the amount of hits landed and from there, it will spit out my total damage.
so im a fighter, with a 1d8 sword + 5 str swinging 3 times

I am trying to covert this formula into a roll20 formula - ignore the bracket usage  [1d8+5]x3 into a roll20 formula using ?{number of hit|0}

or to simplify

how can I tell roll20 macro NOT TO DO this 

[[1d8+5]] = let's say 6
[[1d8+5]] = let's say 8
[[1d8+5]] = let's say 13

but instead, I want it to show the total amount only
total is 27

NVM found a workable solution - requires 3 different macro but it's well represented

macro 1 - Multi Attack VS AC


&{template:default} {{name=Multi Attacks VS AC}} {{attack 1=[[1d20+[[@{pb}]]+@{npcd_dex_mod}]] [[1d20+[[@{pb}]]+@{npcd_dex_mod}]]}} {{attack 2=[[1d20+[[@{pb}]]+@{npcd_dex_mod}]] [[1d20+[[@{pb}]]+@{npcd_dex_mod}]]}} {{attack 3=[[1d20+[[@{pb}]]+@{npcd_dex_mod}]] [[1d20+[[@{pb}]]+@{npcd_dex_mod}]]}} {{attack 4=[[1d20+[[@{pb}]]+@{npcd_dex_mod}]] [[1d20+[[@{pb}]]+@{npcd_dex_mod}]]}} {{attack 5=[[1d20+[[@{pb}]]+@{npcd_dex_mod}]] [[1d20+[[@{pb}]]+@{npcd_dex_mod}]]}} {{attack 6=[[1d20+[[@{pb}]]+@{npcd_dex_mod}]] [[1d20+[[@{pb}]]+@{npcd_dex_mod}]]}}


Macro 2 - Multi Attack - Total amount of Normal Damage

&{template:default} {{name=Multi Attack Total Damage Points}} {{Hits Landed =[[?{Hits Landed|0}]] }}{{Damage=?{Total Damage Points?|
1, [[1d4+@{npcd_dex_mod}]] |
2, [[2d4+(@{npcd_dex_mod})*2]] |
3, [[3d4+(@{npcd_dex_mod})*3]] |
4, [[4d4+(@{npcd_dex_mod})*4]] |
5, [[5d4+(@{npcd_dex_mod})*5]] |
6, [[6d4+(@{npcd_dex_mod})*6]]}}}


Macro 3 - Multi Attack - Total Critical Hit Landed and Damage

&{template:default} {{name=Multi Attack Crit Damage Points}} {{Critical Hits Landed =[[?{Hits Landed|0}]] }}{{Damage=?{Total Damage Points?|
1, [[1d4]] |
2, [[2d4]] |
3, [[3d4]] |
4, [[4d4]] |
5, [[5d4]] |
6, [[6d4]]}}}

If they are all the same formula you could do
[[?{Number of hits|1}d8+(?{Number of hits}*5)]]

LOL - Kyle G [[?{Number of hits|1}d8+(?{Number of hits}*5)]] ----- I HATE YOU LOLOLOLOL

I think I tried that - and got an error.. may have been missing a ] or } or something and gave up. 
I went about it the long way!

curious what does this mean:
?{blah|1} the 1...??? I normally put 0.. what does the 1 do?

any idea to simplify my Macro 1 Attack vs AC?

atm I have it spitting out 6 attacks. Can I tell it to spit whatever number I want it to w/o having to go through the 1, 2, 3, 4, 5, 6, command

Nover C. said:

?{blah|1} the 1...??? I normally put 0.. what does the 1 do?

It's the default value. ?{question} will give you an empty text box, ?{question|0} will give you a text box that already has "0" filled in, ?{question|1} will have "1" filled in, ?{question|answer} will have "answer" filled in, etc.