Show:
add by 2
subtract by 2
add 5
add 3
subtract 3
100

5+2

7

100

5-2

3

100

5+5

10

100

2+3

5

100

10-3

7

200

10+2

12

200

10-2

8

200

10+5

15

200

8+3

11

200

15-3

12

300

15+2

17

300

15-2

13

300

15+5

20

300

10+3

13

300

20-3

17

400

20+2

22

400

20-2

18

400

20+5

25

400

15+3

18

400

25-3

22

500

28+2

30

500

28-2

26

500

25+5

30

500

25+3

28

500

30-3

27