Reykjavik University

Courses/ E-402-STFO/ STFO24/ Module 1/ Problems/ Threes and Fives
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Problem A
Threes and Fives

Languages en is

You are given a positive integer n and should print the sum of positive integers <n which are a multiple of either 3 or 5.

Input

The first and only line of input contains a positive integer n≤1018.

Output

Print the sum of positive integers <n which are a multiple of three or five.

Sample Input 1 Sample Output 1 
1000

233168
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