Adding Data to a Player from Another's Right-Click

This is my code that when you right click on another player while holding Blaze Powder, it prints their name in chat.

Code:

public class PlayerVisibility implements Listener {
    @EventHandler(priority = EventPriority.HIGH)
    public void rightClick(PlayerInteractEntityEvent event){
        Player p = event.getPlayer();
       
        Player rightclick = (Player) event.getRightClicked();
        if(rightclick instanceof Player && p.getItemInHand().getType() == Material.BLAZE_POWDER    ){
            event.getPlayer().sendMessage(rightclick.getName() + "");
        }
        p.getInventory().removeItem(new ItemStack[] {
                new ItemStack(Material.getMaterial(377), 1) });
    }
}

I need a way to store data about how many times a player has been right clicked on.

Thanks,
Jack

 

Code:java

HashMap<String, Integer> clicked = new HashMap<String, Integer>();