# Script Description
- Args:
- A little endian unsigned integer: `number`.
- The `code_hash`(`data_hash`) of a shared library which contains the method `is_even`.
- Returns `CKB_SUCCESS` if and only if any follow conditions satisfied:
- `number` is zero.
- `number` is not even.
- Compile Environment
- Checkout the `ckb-system-scripts v0.5.4`.
- Put this directory into the root directory of `ckb-system-scripts v0.5.4`.
- Checkout `ckb-c-stdlib rev=6665e3a289648a0da69b818ea620aeb5e8d74e3b` into `deps` directory of `ckb-system-scripts v0.5.4`.
- Run `make all-in-docker`.