Program Okrug;
 Const pi=3.1415; // 
 Var r, c, s: real;
Begin
 writeln ('     ');
 write (' : ');
 readln (r);
 c:=2*pi*r; { }
 s:=pi*r*r; { }
 writeln ('c=', c:8:2);
 writeln ('s=', s:8:2);
End.
