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2a+2b<12
a+b<6
a=2 b=3
a=3 b=2
a=1 b=2
a=2 b=1
a=1 b=4
a=4 b=1
a=1 b=1
a=2 b=2
a=3 b=1
a=1 b=3
więc np Ob= 1+5+1+5=12