#! /usr/bin/python
# Finding the sum of all multiples of 3 and 5 below 1,000.

if __name__ == "__main__":
  total = 0
  for n in range(1000):
    if n % 3 == 0 or n % 5 == 0:
      total += n
      
  print str(total) + ' is the sum of all multiples of 3 and 5 below 1,000.'