use std::io::*;
use std::str::FromStr;

fn main() {
    exec(read());
}

fn exec(i: i64) {
    println!("{}", fizzbuzzstring(i));
}

fn fizzbuzzstring(i: i64) -> i64 {
    let a = i / 15;
    let b = i / 5;
    let c = i / 3;
    a * 4 + (b + c - a * 2) * 2
}

fn read<T: FromStr>() -> T {
    let stdin = stdin();
    let stdin = stdin.lock();
    let token: String = stdin
        .bytes()
        .map(|c| c.expect("failed to read char") as char)
        .skip_while(|c| c.is_whitespace())
        .take_while(|c| !c.is_whitespace())
        .collect();
    token.parse().ok().expect("failed to parse token")
}