Print a single integer, giving the area of the road from which Bessie cannot escape.
输出一个整数，表示贝西无法逃脱的道路面积。
Print a single integer, giving the area of the road from which Bessie cannot escape.
算贝西无法逃脱的道路的面积。
Print a single integer, giving the area of the road from which Bessie cannot escape.
算贝西无法逃脱的道路的面积。
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