Xavier's mother told him to drink 4 glasses of water each day. She gave him a cylindrical glass with radius 4 cm.

If Xavier follows this drinking routine for a week, how many litres of water would he drink altogether?

Round your answer to one decimal place.
Please directly answer the question and provide the final value, e.g., 1, 2.5, 300.
Question: Xavier's mother told him to drink 4 glasses of water each day. She gave him a cylindrical glass with radius 4 cm.

If Xavier follows this drinking routine for a week, how many litres of water would he drink altogether?

Round your answer to one decimal place.
Please first conduct reasoning, and then answer the question and provide the final value, e.g., 1, 2.5, 300, at the end.
Question: Xavier's mother told him to drink 4 glasses of water each day. She gave him a cylindrical glass with radius 4 cm.

If Xavier follows this drinking routine for a week, how many litres of water would he drink altogether?

Round your answer to one decimal place.