fn main() {
    let mut mn = String::new();
    std::io::stdin().read_line(&mut mn).ok();
    let mn: Vec<usize> = mn.trim().split_whitespace().map(|s| s.parse().unwrap()).collect();
    let mut m: f64 = mn[0] as f64;
    let n = mn[1];

    for _ in 0..n {
        m = (m * 2.0 + m + 1.0) / 3.0;
    }
    println!("{}", m);
}