Many years later,
Rainbow Island is in the mercy of big boss
qiami. Big boss
qiami is fond of number 9 because each side of the magic cube is made up of 9 small pieces and he changes the face value of circulating currency to 9
0,9
1,9
2,9
3,9
4 Yuan.
One day programmer
Uucloud went to a shop to buy Cat food worth
n Yuan. The shopkeeper
NoMoreWords and
Uucloud are good friends so he will give
Uucloud his change.
Uucloud wants to know how many bills do they need in their trade at least.
For example, if Uucloud wants to buy cat food of 8 Yuan, he will pay a 9 Yuan bill and NoMoreWords will give Uucloud 1 Yuan bill as change. Two paper money are used in this trade.