Problem:
Score : 200 points

Problem Statement

Let us define the FizzBuzz sequence a_1,a_2,... as follows:

If both 3 and 5 divides i, a_i=\mbox{FizzBuzz}.

If the above does not hold but 3 divides i, a_i=\mbox{Fizz}.

If none of the above holds but 5 divides i, a_i=\mbox{Buzz}.

If none of the above holds, a_i=i.

Find the sum of all numbers among the first N terms of the FizzBuzz sequence.

Constraints

1 \leq N \leq 10^6

Input

Input is given from Standard Input in the following format:

N

Output

Print the sum of all numbers among the first N terms of the FizzBuzz sequence.

Sample Input 1

15

Sample Output 1

60

The first 15 terms of the FizzBuzz sequence are:

1,2,\mbox{Fizz},4,\mbox{Buzz},\mbox{Fizz},7,8,\mbox{Fizz},\mbox{Buzz},11,\mbox{Fizz},13,14,\mbox{FizzBuzz}

Among them, numbers are 1,2,4,7,8,11,13,14, and the sum of them is 60.

Sample Input 2

1000000

Sample Output 2

266666333332

Watch out for overflow.

Solution in C# (.NET Core 3.1.201) (judge verdict: Accepted)

using System;
using System.IO;
using System.Linq;
using System.Collections.Generic;
using System.Text;
using System.Numerics;

namespace abc162
{
    class Program
    {
        static void Main(string[] args)
        {
            Console.SetOut(new StreamWriter(Console.OpenStandardOutput()) { AutoFlush = false });
            if (File.Exists("input.txt"))
            {
                Console.SetIn(new StreamReader("input.txt"));
            }
			solve_abc162B();
			Console.Out.Flush();

        }

        public static void solve_abc162D()
        {
            int n = Convert.ToInt32(Console.ReadLine());
            string s = Console.ReadLine();
        }

        public static void solve_abc162C()
        {
            int n = Convert.ToInt32(Console.ReadLine());
            int sum = 0;
            for (int i = 1; i <= n; i++)
            {
                for (int j = 1; j <= n; j++)
                {
                    for (int k = 1; k <= n; k++)
                    {
                        sum += gcd(i, gcd(j, k));
                    }
                }
            }

            Console.WriteLine(sum);
        }
        public static int gcd(int a, int b)
        {
            if (b == 0)
            {
                return a;
            }
            else
            {
                return gcd(b, a % b);
            }
        }

        public static void solve_abc162B()
        {
            int n = Convert.ToInt32(Console.ReadLine());
            long sum = 0;
            for (int i = 1; i <= n; i++)
            {
                if (i % 3 != 0 && i % 5 != 0)
                {
                    sum += i;
                }
            }
            Console.WriteLine(sum);
        }

        public static void solve_abc162A()
        {
            string s = Console.ReadLine();
            Console.WriteLine(s.Contains("7") ? "Yes" : "No");
        }
    }
}