Need help on Period 1-12 demand models

expected to remain stable at $12 per unit for the next 12 periods, and no quantity discounts are available. The maximum order size is 1,000 units. the end of period t, and Yt={1ifanorderisplacedatthestartofperiodtfort=1,2,3,,12.)0otherwise Min()(x1+x2++x12)+()(H1+H2++H12)+( s.t. Period 1 Demand Period 2 Demand Period 3 Demand Period 4 Demand Period 5 Demand Period 6 Demand Period 7 Demand Period 8 Demand Period 9 Demand Period 10 Demand Period 11 Demand Period 12 Demand expected to remain stable at $12 per unit for the next 12 periods, and no quantity discounts are available. The maximum order size is 1,000 units. the end of period t, and Yt={1ifanorderisplacedatthestartofperiodtfort=1,2,3,,12.)0otherwise Min()(x1+x2++x12)+()(H1+H2++H12)+( s.t. Period 1 Demand Period 2 Demand Period 3 Demand Period 4 Demand Period 5 Demand Period 6 Demand Period 7 Demand Period 8 Demand Period 9 Demand Period 10 Demand Period 11 Demand Period 12 Demand