If 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.
Given a natural number N，Find the sum of all the multiples of 3 or 5 below N.
Input a natural number N ( N ≤ 60000 )
Print the answer.
10
23