input: Write a function to calculate the sum of all elements in a list of integers that are divisible by 3. The function should take a list of integers as an input and return the sum of those integers.
  assert divisibleBy3([4, 6, 17, 24, 5, 9])==39
  assert divisibleBy3([1, 2, 3, 4, 5, 6])==9
  assert divisibleBy3([15, 25, 30, 45])==90
  assert divisibleBy3([7, 11, 13])==0
  assert divisibleBy3([])==0
output: def divisibleBy3(lst):
      return sum(x for x in lst if x % 3 == 0)