The easy problem made me mad this afternoon(I'm in China). 
Look at the corner of the picture.The problem ensures that $$$2\le A \le 1000$$$. Could anyone tell me why? Thanks!
The easy problem made me mad this afternoon(I'm in China).
Look at the corner of the picture.The problem ensures that $$$2\le A \le 1000$$$. Could anyone tell me why? Thanks!
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