Multiply the number of sales

Hello,

Could you advise me how can I multiply the displayed number of sales? I was trying to modify the code but I could not find the fragment that is responsible for displaing the number of sales. I would like to add to the code the command that will multiply the number of sales by 2 [items_sales*2]. Can you please indicate this fragment for me so that I can modify the code for my expectations? I would be really, really grateful for that.

Grettings,

Kamil