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

fn main() {
    let mut x = String::new();
    std::io::stdin().read_line(&mut x).ok();
    let mut x: f64 = x.trim().parse().unwrap();
    let mut a = (x * 100_000_000.).round() as i64;
    let mut b = 100_000_000;
    let g = gcd(a, b);
    println!("{}/{}", a / g, b / g);
}