If the ground level is 0 and the frist leval above ground leval is 1 integres can you use?

Yes, if the ground level is considered 0, the first level above ground can be represented by the integer 1. Subsequent levels can be represented as positive integers, with each level above ground corresponding to its integer value (e.g., the second level would be 2, the third level would be 3, and so on). Negative integers could represent levels below ground, if applicable.