program Sqrt1;

uses
  CRT;

const
  eps = 0.000001;
var
  A, L, R, c, MediumBin: double;
  n: integer;
  NegativeNumber, Error: boolean;


  function BinPow(a: double; n: integer): double;
  var
    b: double;
  begin
    if (n = 0) then
      Result := 1
    else if (n mod 2 = 1) then
      Result := BinPow(a, n - 1) * a
    else
    begin
      b := BinPow(a, n div 2);
      Result := b * b;
    end;
  end;

  function Bisection(L, R: real): double;
  begin
    while (R - L) > eps do
    begin
      c := (L + R) / 2;
      MediumBin := BinPow(c,n) - A;
      if MediumBin = 0 then
        break;
      if ((BinPow(L, n) - A) * MediumBin) < 0 then
        R := c
      else
        L := c;
    end;
    Result := c;
  end;

begin
  readln(A, n);
  if (A < 0) then
  begin
    if (n mod 2 <> 0) then
    begin
      NegativeNumber := True;
      A *= -1;
    end
    else
      Error := true;
  end;
  L := 0;
  if A > 1 then
      R := A
  else if A < 1 then
      R := 1;
  Bisection(L, R);
  if not Error then begin
    if NegativeNumber then
      writeln(c * -1: 0: 2)
    else
      writeln(c: 0: 2);
    end
  else
    writeln('ERROR');
  Readkey;
end.