You found potential in the logistics industry and started a large-scale goods transport business. The product delivery cost was calculated as follows.

WEIGHT OF UNIT - RATE PER UNIT

LESS THAN ONE TON $1000

FROM 1 TON BUT LESS THAN 2 TONS $1500

FROM 2 TONS BUT LESS THAN 4 TONS $2500

FROM 4 TONS BUT LESS THAN 10 TONS $3000

FROM OR GREATER 10 TONS $4000

In order to guide the customer's logistics cost, code a python program that calculates the expected logistics cost by inputting the weight of each unit to the user and the number of units to be delivered.