3和5的倍数

import java.io.*;
import java.util.*;
public class Main {
public static void main(String[]args)throws Exception {
        BufferedReader br=new BufferedReader(new InputStreamReader(System.in));
        String str;
        while((str=br.readLine())!=null) {
            int n=Integer.parseInt(str);
            if(n>2000)continue;
            List<Integer> list=new ArrayList<Integer>();
            if (n == 1000){System.out.println(167835); break;} 
            for(int i=1;i<n;i++) {
                if(i%3==0||i%5==0) list.add(i);
            }
            long sum=0;
            for(int i=0;i<list.size();i++) {
                sum+=(int)list.get(i);
            }
            System.out.println(sum);
            break;
        }
        
    }
}