Transporting Water

You are in a camp with 90 liters of water. You want to transport as much water as possible to a second campsite, which is 20 kilometers away.

• You have sufficient number of jerrycans with various capacities. You can leave these jerrycans on your way, and take them back later.
• You can carry at most 30 liters of water at a time.
• You need to consume 2 liters of water per kilometer.

What is the maximum amount of water you can bring to the second campsite, in liters?

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