use proconio::input;
use std::collections::HashMap;
use std::collections::BTreeSet;
use std::ops::ControlFlow::Break;
fn main(){
    input!{
        mut m:f64,mut n:usize,
    }
    for i in (0..n){
        m=(m*2.0)/3.0+(m+1.0)/3.0;
    }
    print!("{}",m)
}