Oblicz sumę wszystkich liczb parzystych od 2 do 1000.
2+4+6+8+10+12+14+16+18+20+22+24+26+28+30+32+34+36+38+40+42+44+46+48+50+52+54+56+58+60+62+64+66+68+70+72+74+76+78+80+82+84+86+88+90+92+94+96+98+100+102+
104+106+108+110+112+114+116+118+120+122+124+126+128+130+132+134+136+138+140+141+144+146+148+150+152+154+156+158+160+162+164+166+168+170+172+174+176+178+180+182+184+186+188+190+192+194+196+198+200+ 202+204+206+208+210+212+214+216+218+220+222+224+226+228+230+232+234+236+238+240+242+244+246+248+250+252+254+256+258+260+262+264+266+268+270+272+274+276+278+280+282+284+286+288+290+292+294+296+298 +300+302+304+306+308+310+312+314+316+318+320+322+324+326+328+330+332+334+336+338+340+342+344+346+348+350+352+354+356+358+360+362+364+366+368+370+372+374+376+378+380+382+384+386+388+390+392+394+396+398 +400+402+404+406+408+410+412+414+416+418+420+422+424+426+428+430+432+434+436+438+440+442+444+446+448+450+452+454+456+458+460+462+464+466+468+470+472+474+476+478+480+482+484+486+488+490+492+494+496+498+
500+502+504+506+508+510+512+514+516+518+520+522+524+526+528+530+532+534+536+538+540+542+544+546+548+550+552+554+556+558+560+562+564+566+568+570+572+574+576+578+580+582+584+586+588+590+592+594+596+598+600+
602+604+606+608+610+612+614+616+618+620+622+624+626+628+630+632+634+636+638+640+642+644+646+648+650+652+654+656+658+660+662+664+666+668+670+672+674+676+678+680+682+684+686+688+690+692+694+696+698+700+702+
704+706+708+710+712+714+716+718+720+722+724+726+728+730+732+734+736+738+740+742+744+746+748+750+752+754+756+758+760+762+764+766+768+770+772+774+776+778+780+782+784+786+788+790+792+794+796+798+800+802+804+806+
808+810+812+814+816+818+820+822+824+826+828+830+832+834+836+838+840+842+844+846+848+850+852+854+856+858+860+862+864+866+868+870+872+874+876+878+880+882+884+886+888+890+892+894+896+898+900+902+904+906+908+910+
912+914+916+918+920+922+924+926+928+930+932+934+936+938+940+942+944+946+948+950+952+954+956+958+960+962+964+966+968+970+972+974+976+978+980+982+984+986+988+990+992+994+996+998+1000= 250500
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2+4+6+8+10+12+14+16+18+20+22+24+26+28+30+32+34+36+38+40+42+44+46+48+50+52+54+56+58+60+62+64+66+68+70+72+74+76+78+80+82+84+86+88+90+92+94+96+98+100+102+
104+106+108+110+112+114+116+118+120+122+124+126+128+130+132+134+136+138+140+141+144+146+148+150+152+154+156+158+160+162+164+166+168+170+172+174+176+178+180+182+184+186+188+190+192+194+196+198+200+ 202+204+206+208+210+212+214+216+218+220+222+224+226+228+230+232+234+236+238+240+242+244+246+248+250+252+254+256+258+260+262+264+266+268+270+272+274+276+278+280+282+284+286+288+290+292+294+296+298 +300+302+304+306+308+310+312+314+316+318+320+322+324+326+328+330+332+334+336+338+340+342+344+346+348+350+352+354+356+358+360+362+364+366+368+370+372+374+376+378+380+382+384+386+388+390+392+394+396+398 +400+402+404+406+408+410+412+414+416+418+420+422+424+426+428+430+432+434+436+438+440+442+444+446+448+450+452+454+456+458+460+462+464+466+468+470+472+474+476+478+480+482+484+486+488+490+492+494+496+498+
500+502+504+506+508+510+512+514+516+518+520+522+524+526+528+530+532+534+536+538+540+542+544+546+548+550+552+554+556+558+560+562+564+566+568+570+572+574+576+578+580+582+584+586+588+590+592+594+596+598+600+
602+604+606+608+610+612+614+616+618+620+622+624+626+628+630+632+634+636+638+640+642+644+646+648+650+652+654+656+658+660+662+664+666+668+670+672+674+676+678+680+682+684+686+688+690+692+694+696+698+700+702+
704+706+708+710+712+714+716+718+720+722+724+726+728+730+732+734+736+738+740+742+744+746+748+750+752+754+756+758+760+762+764+766+768+770+772+774+776+778+780+782+784+786+788+790+792+794+796+798+800+802+804+806+
808+810+812+814+816+818+820+822+824+826+828+830+832+834+836+838+840+842+844+846+848+850+852+854+856+858+860+862+864+866+868+870+872+874+876+878+880+882+884+886+888+890+892+894+896+898+900+902+904+906+908+910+
912+914+916+918+920+922+924+926+928+930+932+934+936+938+940+942+944+946+948+950+952+954+956+958+960+962+964+966+968+970+972+974+976+978+980+982+984+986+988+990+992+994+996+998+1000= 250500