[ 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