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.

Packet : 97288397bell.rar filelist
Debug\bell.exe
Debug\bell.ilk
Debug\bell.obj
Debug\bell.pch
Debug\bell.pdb
Debug\vc60.idb
Debug\vc60.pdb
Debug
bell.cpp
bell.dsp
bell.dsw
bell.ncb
bell.opt
bell.plg
input.txt
output.txt

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