//pascal
uses math;
var x, y : real;
begin
write('x=');
readln(x);
y := (1 + power(x, 2)) / (sqrt(2*x) + 6);
writeln(y:5:2);
end.
//pascal
uses math;
var x, y : real;
begin
write('x=');
readln(x);
y := (1 + power(x, 2)) / (sqrt(2*x) + 6);
writeln(y:5:2);
end.