Article 5-(4). The amount of money to be compensated by the Government under the B class insurance shall be the amount of money obtained when the sum which the exporter can not, on account of causes falling under any one of the items of Article 5-(2) paragraph 1, collect by the time of payment (on account of the cause falling under item (5) of the same paragraph, by the time when six months have elapsed since the time of payment;hereinafter the same), minus the amount of money referred to in each of the following items, is multiplied by the ratio, against the insurable value, of the amount insured: