use std::io::*;

fn rec(sai: &[usize], c: usize) -> f64 {
    if c == 0 {
        1.0
    } else {
        let mut res = 0.0;
        for &s in sai.iter() {
            res += s as f64 * rec(&sai, c - 1) / 6.0;
        }
        res
    }
}

fn main() {
    let mut s: String = String::new();
    std::io::stdin().read_to_string(&mut s).ok();
    let mut itr = s.trim().split_whitespace();
    let p: usize = itr.next().unwrap().parse().unwrap();
    let c: usize = itr.next().unwrap().parse().unwrap();

    let sai1: Vec<usize> = [2, 3, 5, 7, 11, 13].to_vec();
    let sai2: Vec<usize> = [4, 6, 8, 9, 10, 12].to_vec();

    println!("{:.10}", rec(&sai1, p) * rec(&sai2, c));
}