If the application contains
more than 30 sheets, the international filing fee is increased, with a fixed sum to be paid for each sheet in excess of 30 sheets. This extra fee is considered part of the international filing fee and must be paid by the applicant together with the (basic) filing fee. The applicant must compute the extra amount himself and not wait for a communication, because as from expiry of the one month time limit the missing amount may only be validly paid together with a late payment fee (see
point 185).