var
    a, num, i, key, marker: integer;
begin
    readln(num);
    a := num;
    key := 0; 
    i := 1;
    while i <= 3 do
    begin 
        marker := a mod 10;
        if marker = 1 then key := 1;
        a := a div 10;
        i := i + 1;
    end;
if key = 1 then writeln(2*num)
else writeln(num*num);
end.