text: #2/14/2020
  #This puzzle requires some basic numerical manipulation on a set of numbers
  
  import math
  
  input = open("input.txt")
  data = input.read()
  
  total = 0
  for value in data.splitlines():
  	total += math.floor(int(value) / 3) - 2
  
  print("Fuel Required:", total)
  
  #Correct answer: 3368364