$W$	Set of pharmacy
$V$	Set of all vehicles
$D$	Set of distribution center
$S$	Set of warehouse
$H$	Set of hospital
$P,P{}^{\prime }$	Set of main and local producers
$m$	Index of medicines
$t$	Index of period (day)
$u$	Index of the capacity level of DC
$o$	Index of the capacity level of warehouse
$\mu$	Index of the capacity level of pharmacy
$\epsilon$	Index of the capacity level of hospital
$\varnothing$	Index of the capacity level of main and local producers