fn read<T: std::str::FromStr>() -> T {
    let mut s = String::new();
    std::io::stdin().read_line(&mut s).ok();
    s.trim().parse().ok().unwrap()
}

fn main() {
  let input: u64 = read();

  let ans: u64 = (1..=input).map(|i| {
    if i % 15 == 0 {
      4
    } else if i % 3 == 0 {
      2
    } else if i % 5 == 0 {
      2
    } else {
      0
    }
  }).sum();

  println!("{}", ans)
}