#!/usr/bin/env python3
# -*- coding: utf-8 -*-
"""
Created on Tue Jul 31 20:56:07 2018

@author: Maverick
"""

#we list all the natural numbers below 10 that are multiples of 3 or 5, we get 
#3, 5, 6 and 9. The sum of these multiples is 23.

#Find the sum of all the multiples of 3 or 5 below 1000.

n = 0;

for i in range(1,1000):
    if(i%3==0) or (i%5==0):
        n = n+i

print(n)
        