no limit

var
N,i,counter : integer;
res : double;
begin
  readln(N);

  counter := 0;
  i := 2;
  if (N < 10) then res := 0
  else res := 1;

  while counter < 100 do begin
    if(N < 10) and (i mod 2 = 0) then begin res := res + i;inc(counter); end
    else if(N > 10) and (i mod 2 = 0) then begin res := res * i; inc(counter); end;
    inc(i);
  end;

  writeln(res);
end.