import numpy as np

triangles = np.loadtxt('MODEL.CSV', delimiter=',', dtype='float')
volumes = []

for triangle in triangles:
    v1, v2, v3 = np.array_split(triangle, 3)
    volumes.append(v1.dot(np.cross(v2, v3)) / 6.0)


print(round(sum(volumes) / 1000, 3))