@EventHandler(priority=EventPriority.HIGHEST, ignoreCancelled=false)
    public void onPickup(PlayerPickupItemEvent e) {
        Player player = e.getPlayer();
        Inventory inventory = player.getInventory();
        ItemStack[] contents = inventory.getContents();
        Item foundItem = e.getItem();
        ItemStack foundItemStack = foundItem.getItemStack();
        int invSize = inventory.getSize();
        for(int i = 0; i < invSize; i++) {
            ItemStack item = contents[i];
            if(item != null) {

                ItemMeta foundMeta = foundItem.getItemStack().getItemMeta();
                ItemMeta invMeta = item.getItemMeta();

                Material foundType = foundItem.getItemStack().getType();
                Material invType = item.getType();

                int foundAmount = foundItem.getItemStack().getAmount();
                int invAmount = item.getAmount();

                if(item.isSimilar(foundItemStack)  && foundType == invType && foundMeta.isUnbreakable() && invMeta.isUnbreakable()) {
                    int math = (foundAmount + invAmount);
                    if(math < 65) {
                        e.setCancelled(true);
                        foundItemStack.setAmount(0);
                        foundItem.remove();
                        item.setAmount(foundAmount + invAmount);

                    }else {
                        System.out.println("Count invAmount before Loop: " + invAmount);
                        System.out.println("Count foundAmount before Loop: " + foundAmount);
                        while(invAmount <= 63 && foundAmount >= 1) {
                            System.out.println("Count invAmount in Loop: " + invAmount);
                            System.out.println("Count foundAmount in Loop: " + foundAmount);
                            invAmount = invAmount + 1;
                            foundAmount = foundAmount - 1;

                        }
                        System.out.println("Count invAmount as final result: " + invAmount);
                        System.out.println("Count foundAmount as final result: " + foundAmount);
                            e.setCancelled(true);
                            foundItemStack.setAmount(foundAmount);
                            foundItem.remove();
                            item.setAmount(invAmount);

                    }
                }

            }
        }
    }