a cube is divided into 216 identical cubelets . each cut is made parallel to some surface of the cube . but before doing that , the cube is painted with green on one set of opposite faces , red on another set of opposite faces , and blue on the third set of opposite faces . how many cubelets are painted with exactly one colour ?
n0 = 216.0
t0 = 2.0 * 4.0
t1 = t0 * 3.0
t2 = n0 - t1
answer = t2 / 2.0
print(answer)