Show:
1-2
3-4
5-6
7-8
100

1x1

1

100

3x1

3

100

5x2

10

100

7x1

7

200

1x5

5

200

3x3

9

200

5x4

20

200

7x3

21

300

2x3

6
300

3x5

15

300

5x7

35

300

8x2

16

400

2x5

10

400

4x2

8

400

6x6

36

400

8x4

32

500

2x6

12

500

4x6

24

500

6x7

42

500

8x8

64