#描述#
同上题 "Bnofsutm
uhnor !Xnt!iwd!fnu!uid!jdx !On!hoqtu-!xnt!ktru!odde!un!ntuqtu!#Vdmbnld!un![KTU!@BL.HBQB!Ud
l #!vhuintu!uid!ptnu`uhno/"
#格式#
##输入格式##
N<=1000
##输出格式##
同
#样例1#
##样例输入1##
同
##样例输出1##
同
#限制#
2000ms
32768KB
#提示#
#来源#
dd
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