READ，NX=1.0IF(N＞=0)X=2XIF(N＞=5)X=2X+1.0IF(N＞15)X=3X-1.0PRINT*，XEND如果从键盘输入15，则程序的运行结果是：()。

A.1.0

B.2.0

C.5.0

D.14.0

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