# Vlak

import matplotlib.pyplot as plt
import numpy as np

plt.figure (figsize = (8, 8))

ax = plt.axes (projection = "3d")

x = np.arange (0, 25, 0.05)
y = np.arange (0, 25, 0.05)

x, y = np.meshgrid (x, y)
z = 2
G = z * np.log ((x * z + 1) / (y + 2))

ax.plot_surface (x, y, G, color = "lightgreen")

plt.show ()