Divided into 1/7 and 2/7, and the rest is 4/7.
The first 1 day 1/7
Give 2/7 the next day, and ask for 1/7.
Give it to 1/7 on the third day.
Give it to 4/7 on the fourth day and get it back 1/7 2/7.
Give it to 1/7 on the fifth day.
Give 2/7 on the sixth day, and take back 1/7.
Give it to 1/7 on the seventh day.