{"trustable":false,"sections":[{"title":"","value":{"format":"MD","content":"\u003cpre\u003e\n给定一个正整数m,你需要找到一个最小的正整数n,满足n!的末尾恰好有m个零。\n\u003cpre\u003e\n"}},{"title":"Input","value":{"format":"MD","content":"\u003cpre\u003e\n第一行为一个整数T代表数据组数。(T\u003c\u003d1e4)\n接下来T行,每组样例一行。\n每组样例输入一个整数m。(1\u003c\u003dm\u003c\u003d1e8)\n\u003cpre\u003e"}},{"title":"Output","value":{"format":"MD","content":"\u003cpre\u003e\n对于每组样例,按照\"Case i: x\"或者\"Case i: impossible\"的格式输出。\n(如果不存在任何一个数的阶乘末尾有m个零,输出impossible)\n\u003cpre\u003e"}},{"title":"Sample Input","value":{"format":"MD","content":"\u003cpre\u003e3\n1\n3\n5\n\u003c/pre\u003e"}},{"title":"Sample Output","value":{"format":"MD","content":"\u003cpre\u003eCase 1: 5\nCase 2: 15\nCase 3: impossible\n\u003c/pre\u003e"}}]}