Roaming Vehicles Company has been manufacturing buggies for 10 years. Manufacturing a buggy takes 1.5 units of wood and 1 unit of steel. Scheduled production of buggies for January and February is 520 and 600 units, respectively. The ending inventory of wood is planned to be 30% of next month's production needs. Steel inventory is expected to increase 5 units in each of the next two months.

What is the number of units of wood that need to be purchased by Roaming Vehicles Company during January?