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2014-10-16T18:49:12+03:00
5+8+11+...+305=
=6-1+9-1+...+306-1=
=(6+9+12+...+306)-101=
=3(2+3+4+...+102)-101=
=3[(1+2+3+..+102)-1)-101=
=3[102*103/2-1]-101=
=3*5252-101=
=15655