>>> 2 + 3
5
>>> 1 + 2 * 3 - 4
3
>>> 12 * 5 / 3 * 2
40.0
>>> 5 / 8
0.625
>>> 23 // 7
3
>>> 17 % 5 - 1
1
>>> 3 * (4 + 5) + 5
32
>>> (2 + (7 + 2) / 3 - 4) / (-2 / 7 + (19 - 3 * 4) / 8)
1.696969696969697