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1 = 1

2 = 2

3 = 2+1

4 = 6-2

5 = 6-1

6 = 6

7 = 6+1

8 = 6+2

9 = 9

10 = 9+1

11 = 9+2

12 = 9+2+1

13 = 2*6+1

14 = 9+6-1

15 = 9+6

16 = 9+6+1

17 = 9+6+2

18 = 9+6+2+1

19 = 9*2+1

20 = (9+1)*2

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