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Function: require_once
cm, 10cm인 직육면체 모양의 벽돌을 같은 방향으로 빈틈없이 쌓아서 정육면체 모양을 만들려고 한다. 벽돌을 되도록 적게 사용하여 만들려고 할 때, 필요한 벽돌의 개수는 900개이다. x의 값을 구하고, 풀이과정도 서술하여라.
