Farmer John's cows have recently become fans of playing a simple number game
called "FizzBuzz". The rules of the game are simple: standing in a circle, the
cows sequentially count upward from one, each cow saying a single number when it
is her turn. If a cow ever reaches a multiple of 3, however, she should say
"Fizz" instead of that number. If a cow reaches a multiple of 5, she should say
"Buzz" instead of that number. If a cow reaches a multiple of 15, she should
say "FizzBuzz" instead of that number. A transcript of the first part of a game
is therefore:

1, 2, Fizz, 4, Buzz, Fizz, 7, 8, Fizz, Buzz, 11, Fizz, 13, 14, FizzBuzz, 16

Having a slightly more limited vocabulary, the version of FizzBuzz played by the
cows involves saying "Moo" instead of Fizz, Buzz, and FizzBuzz. The beginning
of the cow version of the game is therefore

1, 2, Moo, 4, Moo, Moo, 7, 8, Moo, Moo, 11, Moo, 13, 14, Moo, 16

Given $N$ ($1 \leq N \leq 10^9$), please determine the $N$th number spoken in
this game.

SCORING
Test cases 2-5 satisfy $N\le 10^6.$

INPUT FORMAT:
The input consists of a single integer, $N$.

OUTPUT FORMAT:
Please print out the $N$th number spoken during the game.

SAMPLE INPUT:
4
SAMPLE OUTPUT:
7

The 4th number spoken is 7. The first 4 numbers spoken are 1, 2, 4, 7, since we
skip over any time a cow says "Moo".

Problem credits: Brian Dean

见题面

见题面