old_contents: import json
  
  from machine import Machine
  
  
  COFFEE_COST = 50
  
  with open("input") as f:
    machine = Machine(COFFEE_COST, json.loads(f.read()))
  
  while True:
    machine.make_coffee()
  
new_contents: import json
  
  from machine import Machine
  
  
  COFFEE_COST = 50
  
  with open("input") as f:
    machine = Machine(COFFEE_COST, json.loads(f.read()))
  
    machine.make_coffee()
  
subject: Remove redundant while