How can I change two variables at the click of a button?

Unity Engine
,
1

The character is at the store, I want to press E to buy ninja stars, and it subtracts 10 from “money” variable, and also adds 5 to the “stars” variable. How do I code this?

2 
if (Input.GetKeyDown( KeyCode.E))
{
  money = money - 10;
  stars = stars + 5;
}
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