Sheikh Mansoor decided to stay at a luxurious hotel in Dubai. The Sheikh has got 3 gold bars which weigh as 4kg, 2kg, and 1kg respectively. The charge of the hotel is 1kg gold per day and they do not take any advances. Sheikh needs to stay at the hotel for seven days. How can the Sheikh pay for hotel easily?

Day 1:
Give 1kg gold bar.

Day2:
Give 2kg gold bar and take back 1kg gold bar back

Day3:
Give 1kg gold bar

Day4:
Give 4kg gold bar and take back 1kg gold bar back

Day5:
Give 1kg gold bar

Day6:
Give 2kg gold bar and take back 1kg gold bar back

Day7:
Give 1kg gold bar.

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