program rad;
var R, L, S, P:real;
begin
read (R);
p:=3.14;
L:=2*P*R;
S:=P*R*R;
if S>L then write (s) else write (l);
end.
program rad;
var R, L, S, P:real;
begin
read (R);
p:=3.14;
L:=2*P*R;
S:=P*R*R;
if S>L then write (s) else write (l);
end.