input: Write a function to calculate the sum of the series 1 + ½ + ⅓ + ... + 1/n. The function should take an integer n as input and return the sum of the series. If the input is less than 1, the function should return 0.
  def seriesSum(n):
      if n < 1:
          return 0
      total = 0
      for i in range(1, n + 1):
          total += 1 / i
      return total
  
  assert seriesSum(5) == 2.283333333333333
  assert seriesSum(1) == 1.0
  assert seriesSum(0) == 0
  assert seriesSum(10) == 2.9289682539682538
output: def seriesSum(n):
      if n < 1:
          return 0
      total = 0
      for i in range(1, n + 1):
          total += 1 / i
      return total