3. The three sides are three consecutive positive integers, and its perimeter is less than or equal to 100 of the acute triangle has $\qquad$.

将上面的文本翻译成英文，请保留源文本的换行和格式，直接输出翻译结果。 

Note: The note is not part of the translation but is provided to clarify the instruction. The actual translation is above.
3. 29