Given positive integer n, to calculate a collection of n elements (1,2,?, N) can be divided into the number of different nonempty sets. By providing input data file input.txt. Document line 1 is the number of elements n.

bell.cpp
bell.dsp
bell.dsw
bell.ncb
bell.opt
bell.plg
Debug
.....\bell.exe
.....\bell.ilk
.....\bell.obj
.....\bell.pch
.....\bell.pdb
.....\vc60.idb
.....\vc60.pdb
input.txt
output.txt

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