const
 N=20;
var
 a: array [1..N] of integer;
 i, j, min: integer;
begin
 min:=1000;
 for i:=1 to N do
 readln(a[i]);
 for i:=1 to N do
  begin
   if (a[i] mod 2=0) and (a[i] mod 3<>0) then
    if a[i] < min  then
       min:=a[i];
   end;
 writeln(min);


end.