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 (GCC 9.2.1) (judge verdict: Wrong Answer)

#include<stdio.h>
int main(void){
  int N;
  int wa=0;
  int wafb=0;
  int sowa=0;
  int f=0;
  int b=0;
  int fb=0;
  int i,j;
  scanf("%d",&N);
  for(i=0;i<=N;i++){
    wa=wa+i;
  }
  for(i=0;f<=N;i++){
      f=f+i*3;
  }
  for(i=0;b<=N;i++){
    b=b+i*5;
  }
  for(i=0;fb<=N;i++){
    fb=fb+i*15;
  }
  wafb=f+b-fb;
  sowa=wa-wafb;
  printf("%d",sowa);
  return 0;
}