diff --git a/exam/ex25/input.png b/exam/ex25/input.png
new file mode 100644
index 0000000..be5978b
Binary files /dev/null and b/exam/ex25/input.png differ
diff --git a/exam/ex25/main.py b/exam/ex25/main.py
new file mode 100644
index 0000000..c2ba156
--- /dev/null
+++ b/exam/ex25/main.py
@@ -0,0 +1,28 @@
+import numpy as np
+from scipy import misc
+
+
+image = misc.imread("input.png")
+
+
+N = min(image.shape[:-1])
+image = image[:N, :N, :]
+
+old_image = image.copy()
+this_image = np.zeros(image.shape)
+i = 0
+
+print()
+
+
+while((this_image != image).any()):
+	for x in range(N):
+		for y in range(N):
+			this_image[x, y] = old_image[(2*x + y) % N, (x + y) % N]
+	old_image = this_image.copy()
+	i += 1
+	print(i / (3*N), "%", " "*15, end="\r", flush=True)
+	misc.imsave("output/{}.png".format(i), this_image)
+
+
+print()