P

OS

S

R

D

P

1

3

4

5

7

OS

1/3

1

3

4

5

S

1/4

1/3

1

2

4

R

1/5

1/4

1/2

1

3

D

1/7

1/5

1/4

1/3

1

Total ${\displaystyle \sum a_i}$

1.92

4.78

8.75

12.33

20