import sequtils,strutils
var
    M,N : int
    A : float64
    
(M, N) = stdin.readline.split.map(parseInt)
A = M.float64
for n in 1..N:
    var
        a : float64 = A * 2 / 3
        b : float64 = (A + 1) / 3
    A = a + b
echo A