<|system|>
Evaluate $\lfloor17.2\rfloor+\lfloor-17.2\rfloor$.</s>.
<|user|>
Can you answer based on context?
<|assistant|>
The greatest integer less than $17.2$ is $17$, and the greatest integer less than $-17.2$ is $-18$, so our answer is $-1$.