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Arithmetic is directly available in cicada.
```
$ 1 + 1
2
$ 3 * 7
21
$ 7 / 3
2
$ 2 ^ 16 - 1
65535
```
```
$ (1 + 1) * 7
14
```
Whenever there is a `.` in command, the whole calculation will be in float.
```
$ 7.0 / 3
2.3333333333333335
$ 7.0 / 3 + 10000
10002.333333333334
```
A single number will not be treated as arithmetic. It will be treated as
a regular command.
```
$ 42
cicada: 42: command not found
```