Description

同上题 "Bnofsutmuhnor !Xnt!iwd!fnu!uid!jdx !On!hoqtu-!xnt!ktru!odde!un!ntuqtu!#Vdmbnld!un![KTU!@BL.HBQB!Udl #!vhuintu!uid!ptnu`uhno/"

Input

N<=1000

Output

同

Sample

Input

同

Output

同

Source: dd