500 mL of 1.2 M KI solution is mixed with 500 mL of 0.2 M KMnO₄ solution in basic medium. The liberated iodine was titrated with standard 0.1 M Na₂S₂O₃ solution in the presence of starch indicator till the blue color disappeared. The volume (in L) of Na₂S₂O₃­ consumed is_______. (Nearest integer)