[ 1 -3/5 ] [ -1 3/5 ] [ 7/5 ] [ -7/5 ] [ 0 ]
f(z) = 5/3*z^3 - 34/15*z
*
[ 1/2 4/5 ] [ -1/2 -4/5 ] [ 7/10 ] [ -7/10 ] [ 0 ]
f(z) = -5/2*z^3 + 89/40*z
*
[ 1/2 -4/7 ] [ -1/2 4/7 ] [ 13/14 ] [ -13/14 ] [ 0 ]
f(z) = 7/2*z^3 - 113/56*z
*
[ 1 7/15 ] [ -1 -7/15 ] [ 13/15 ] [ -13/15 ] [ 0 ]
f(z) = -15/7*z^3 + 274/105*z
*
[ 1/4 -4/5 ] [ -1/4 4/5 ] [ 19/20 ] [ -19/20 ] [ 0 ]
f(z) = 5*z^3 - 281/80*z
*
TOTAL: 5