A business makes and sells backpacks. The business expects the following sales activity for the financial year:

Quarter 1: 4,740 units

Quarter 2: 5,970 units

Quarter 3: 7,533 units

Quarter 4: 4,002 units

The business has 400 made backpacks in inventory at the start of quarter 1. The business likes to keep ending inventory of backpacks at 10% of next quarter's sales.

Calculate the production budget for quarter 1. Round your answer to the nearest unit (using normal maths rounding). Round your answer right at the end of your calculation.