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2014-05-17T14:17:30+03:00
F(1)=2-1=1
f(2)=2-1=0
f(3)=2-3=-1
................
f(99)=2-99=-97
f(100)=2-100=-98

S=(1-98)*100/2
S=(-97)*50
S= -4850
3 5 3