20
15
111000000000011
111000000000011
111100000000011
111100000000011
110110000000011
110011000000011
110011000000011
110001100000011
110000110000011
110000110000011
110000011000011
110000011000011
110000001100011
110000000110011
110000000110011
110000000011011
110000000001111
110000000001111
110000000000111
110000000000111
