I need to save some money to buy a gift. I think I can do something like that:
First week (W0) I save nothing on Sunday, 1 on Monday, 2 on Tuesday... 6 on Saturday, second week (W1) 2 on Monday... 7 on Saturday and so on according to the table below where the days are numbered from 0 to 6.
Can you tell me how much I will have for my gift on Saturday evening after I have saved 12? (Your function finance(6) should return 168 which is the sum of the savings in the table).
Imagine now that we live on planet XY140Z-n where the days of the week are numbered from 0 to n (integer n > 0) and where I save from week number 0 to week number n included (in the table below n = 6).
How much money would I have at the end of my financing plan on planet XY140Z-n?
| -- | Su | Mo | Tu | We | Th | Fr | Sa |
|---|---|---|---|---|---|---|---|
| W6 | 12 | ||||||
| W5 | 10 | 11 | |||||
| W4 | 8 | 9 | 10 | ||||
| W3 | 6 | 7 | 8 | 9 | |||
| W2 | 4 | 5 | 6 | 7 | 8 | ||
| W1 | 2 | 3 | 4 | 5 | 6 | 7 | |
| W0 | 0 | 1 | 2 | 3 | 4 | 5 | 6 |
finance(5) --> 105
finance(6) --> 168
finance(7) --> 252
finance(5000) --> 62537505000
try to avoid nested loops