program z2;

const
  x = 0.82413;
  y = 3.15874;

function ArcSin(x:real):real;
begin
arcsin:=arctan(x/sqrt(1-sqr(x)));
end;


function step(x, st: real): real;
begin
  step := exp(st * ln(x));
end;

function f(x, y: real): real;
begin
  f := (exp(-y) + arcsin(x / 2)) / (step((step(x, 2) + sqrt(step(x, 3) + y)), 1 / 3) + step(x + step(x + y, 1 / 3), 2));
end;

var
  z: real;

begin
  z := f(x, y);
  writeln(z:20:18);
  readln;
  end.