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4,5-->2

8,9,10,11-->4,5-->2

similarly till 64,65....95-->2

Total no. of 1's excluding 1,2, and 3  = 2+4+8+16+32=62

62+F(1)+F(2)= 64 remaining are 36 converging to F(3)=-1

Required value is 64+36(-1)=28

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