Your task is to make function, which returns the sum of a sequence of integers.
The sequence is defined by 3 non-negative values: **begin**, **end**, **step**.
If **begin** value is greater than the **end**, function should returns **0**
*Examples*
~~~if-not:nasm
~~~
This is the first kata in the series:
1) Sum of a sequence (this kata)  
2) [Sum of a Sequence [Hard-Core Version]](https://www.codewars.com/kata/sum-of-a-sequence-hard-core-version/javascript)
def sequence_sum(b, e, s):
  k = (e - b) // s
  return (1 + k) * (b + s * k / 2) if b <= e else 0
def sequence_sum(b, e, s):
  k = (e - b) // s
  return (1 + k) * (b + s * k / 2) if b <= e else 0