Hello! Im trying to create a comand that gives the player money. But it's saying arg 1 iant a solid number. How can I fix this?

Code (Text):

1.  command / mrbeast <number>:
2.     permission:op
3.     trigger:
4.         if arg 1 is a number:
5.           add %arg-1% to player's balance
6.            send "&C%arg-1%$ &4 coins has been added to your account!" to player
7.         else:
8.            send"&4%arg-1% isn't a solid number. Sorry!"

 

It let me do it, but dont add the money to the player account

 

it worked. ty