Sum of multiples of 3 or 5

Complete the function solution, which returns the sum of all the positive integers from 1 to n that are multiples of 3 or multiples of 5. n itself is included.

A number that is a multiple of both 3 and 5, such as 15, is added only once.

Function

solution(n)

Constraints

• n is an integer from 1 to 1,000,000,000.

Examples

Starter code

def solution(n):
    answer = 0
    return answer