Number + しか〜ない

X しか 〜ない is used to express that the given amount is all there is, with a sense of limitation or insufficiency. It emphasizes that the speaker cannot go beyond that amount; it often carries a nuance of constraint, disappointment, or inevitability. The object before しか is the limited quantity or number, and the verb phrase 〜ない completes the negative statement. This pattern is commonly used in everyday situations to talk about limited resources, small counts, or minimal opportunities.