{"trustable":true,"sections":[{"title":"","value":{"format":"HTML","content":" \n \u003cp\u003e\u003cspan\u003e设 f(n) 表示 n 的每一位数字的平方之和,求 [a,b] 中有几个 n 满足 k × f(n)\u003dn\u003c/span\u003e\u003c/p\u003e \n "}},{"title":"Input","value":{"format":"HTML","content":" \n \u003cp\u003e第一行三个正整数 k, a, b\u003c/p\u003e \n \u003cp\u003e1 ≤ k, a, b ≤ 10\u003csup\u003e18\u003c/sup\u003e,且a ≤ b\u003c/p\u003e \n "}},{"title":"Output","value":{"format":"HTML","content":" \n \u003cp\u003e\u003cspan\u003e输出一个非负整数,表示解的个数\u003c/span\u003e\u003c/p\u003e \n \u003cp\u003e\u003c/p\u003e \n "}},{"title":"Sample Input","value":{"format":"HTML","content":" \n \u003cpre\u003e5 10 20\u003c/pre\u003e \n "}},{"title":"Sample Output","value":{"format":"HTML","content":" \n \u003cpre\u003e1\u003c/pre\u003e \n "}}]}