fn main() {
    let x = read::<f64>();
    let mut p = (x * 100000000.0).round() as i64;
    let mut q = 100000000;
    let g = gcd(p, q);
    p /= g;
    q /= g;
    println!("{}/{}", p, q);
}

fn gcd(a: i64, b: i64) -> i64 {
    if b == 0 {
        return a;
    }
    gcd(b, a % b)
}

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()
}