How to edit amount of items in inventory

[Sopie]

Now i know you may think this is cheating because it is but i just want to say i cant be stuffed mining out rocks to get a deluxe barn for 2 hours so how the flip flop do i change the amount of stone in my inventory.
thanks electro
ps: im asking how to do it through changing files not mods

[dino_inc]

I'd use this, it's not a mod, just an external editor: https://www.nexusmods.com/stardewvalley/mods/127/?
Otherwise, go to %appdata%, open the Stardew Valley folder, find the save you want to modify, and open it up in a text editor and ctrl + f for stone, then change the count value and save.