program HelloWorld;

function m(a, b : real) : real;
begin
    m:=(a*a+b*b)/(a*a+5*a*b+4*b*b+4);
end;

var
    S, T, y: real;

begin
    Read(s,t);
    y:=m(2,s)+m(t,s)+m(2*s,s*t);
    writeln(y);
end.