When making a Dungeons & Dragons character, an alternative to rolling ability scores is to assign them within a power budget called point buy. Higher ability scores cost more points, especially towards the upper end: a score of 8 is free, and raising a score by 1 costs 1 point, except raising to 15 or 16 costs 2 points, and raising to 17 or 18 costs 3 points.
+-------+------+
| Score | Cost |
+-------+------+
| 8 | 0 |
| 9 | 1 |
| 10 | 2 |
| 11 | 3 |
| 12 | 4 |
| 13 | 5 |
| 14 | 6 |
| 15 | 8 |
| 16 | 10 |
| 17 | 13 |
| 18 | 16 |
+-------+------+
In list form:
[(8, 0), (9, 1), (10, 2), (11, 3), (12, 4), (13, 5), (14, 6), (15, 8), (16, 10), (17, 13), (18, 16)]
The point buy cost is summed for all six ability scores.
Ability scores: 16 17 8 13 8 12
Point buy cost: 10 + 13 + 0 + 5 + 0 + 4 = 32
Given six ability scores, each 8 through 18, output the total point buy cost. Fewest bytes wins.
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