A, B, C, and D represent four different numbers, which are calculated according to the following division formula: \sqrt(A){BCD}, \sqrt(A){BDC}, \sqrt(A){BCD}, the result The remainder is 4, if B=7, C=1, then A*D=how much.
A、B、C、D分别代表四个不同的数字，依下列除式代入计算：\sqrt(A){BCD}，\sqrt(A){BDC}，\sqrt(A){BCD}，结果余数都是4，如果B=7，C=1，那么A*D=多少．
<result>45</result>