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5,6,7,8
...............
992,993,994,995
996,997,998,1000
suma obwodow to suma liczb 1 d0 1000
to ciag arytmetyczny w ktorym a1=1 r=1
S=1/2*(a1+a1000)*1000
S=500*1001=500500
Odp S=500500
pozdrawiam