4. Where a fine cannot be paid, a court may replace the outstanding amount of a fine by community service calculated as ten hours of community service for each tax-free minimum individual income established by law, or by correctional labor calculated as one month of correctional labor for four tax-free minimum incomes established by law, but for a period not exceeding two years. Article 54. Revocation of a military or special title, rank, grade or qualification class A person, who has a military or special title, rank, grade or qualification class and was convicted of a grave or special grave offense, may be subject to revocation of his/her military or special title, rank, grade or qualification class by a judgment of court. Article 55. Deprivation of the right to occupy certain positions or engage in certain activities 1. Deprivation of the right to occupy certain positions or engage in certain activities may be imposed as primary punishment for a term of two to five years or as additional punishment for a term of one to three years. 2. Deprivation of the right to occupy certain positions or engage in certain activities as additional punishment may also be imposed without reference to a sanction of an article in the Special Part of this Code, if a court, having regard to the nature of the offense committed by a person in office or in connection with a certain activity, the character of the person convicted, and other circumstances of the case, decides that such person should be deprived of the right to occupy certain positions or engage in certain activities. 3. Where deprivation of the right to occupy certain positions or engage in certain activities is imposed as additional punishment together with the arrest, restraint of liberty, custody of military servants in a penal battalion, or imprisonment for a determinate term, it shall extend through all the term of the primary punishment, and also for a term specified in a judgment of court that came into effect. For this purpose, the term of additional punishment is calculated from the moment of completion of the primary punishment; and - for the purpose of punishment imposed in the form of deprivation of the right to occupy certain positions or engage in certain activities as additional to other primary punishments, and also for the purpose of Article 77 of this Code - is calculated from the moment that the judgment comes into effect. Article 56. Community service 1. Community service consists in performance, by a convicted person during hours free from work or studies, of unpaid work valuable to the community, as determined by the local government authorities. 2. The term of community service imposed may be from 60 to 240 hours and its duration in any single day may not be longer than 4 hours. 4. Community service may not be imposed upon persons who have been certified to have a first or a second degree disability, pregnant women, persons of retirement age, and military servants in active service. Article 57. Correctional labor 1. The punishment of correctional labor shall be imposed for a term of six months to two years and is to be served by the convicted person at the place of his/her employment. A