diff --git a/filter.py b/filter.py
index 4150df2..f782d21 100644
--- a/filter.py
+++ b/filter.py
@@ -1,28 +1,38 @@
 from PIL import Image
 import numpy as np
-img = Image.open("img2.jpg")
-arr = np.array(img)
-a = len(arr)
-a1 = len(arr[1])
-i = 0
-while i < a - 11:
-    j = 0
-    while j < a1 - 11:
-        s = 0
-        for n in range(i, i + 10):
-            for n1 in range(j, j + 10):
-                n1 = arr[n][n1][0]
-                n2 = arr[n][n1][1]
-                n3 = arr[n][n1][2]
-                M = n1 + n2 + n3
-                s += M
-        s = int(s // 100)
-        for n in range(i, i + 10):
-            for n1 in range(j, j + 10):
-                arr[n][n1][0] = int(s // 50) * 50
-                arr[n][n1][1] = int(s // 50) * 50
-                arr[n][n1][2] = int(s // 50) * 50
-        j = j + 10
-    i = i + 10
-res = Image.fromarray(arr)
-res.save('res.jpg')
+
+correct_path = False
+CELL_X_OFFSET = 10
+CELL_Y_OFFSET = 10
+GREY_GRADATION = 50
+while not correct_path:
+    img_path = input("Enter path to image for filtering: ")
+    try:
+        img = Image.open(img_path)
+        correct_path = True
+    except:
+        print("Incorrect path/file format, please try again")
+img_matrix = np.array(img)
+len_x = len(img_matrix)
+len_y = len(img_matrix[1])
+cell_x = 0
+while cell_x < len_x:
+    cell_y = 0
+    while cell_y < len_y:
+        sum_RGB = 0
+        sum_RGB += np.sum(img_matrix[cell_x:cell_x + CELL_X_OFFSET, cell_y:cell_y + CELL_Y_OFFSET]) // 3
+        sum_RGB = int(sum_RGB // 100)
+        grey_matrix = np.zeros((CELL_X_OFFSET, CELL_Y_OFFSET, 3))
+        grey_matrix[:] = int(sum_RGB // GREY_GRADATION) * GREY_GRADATION
+        img_matrix[cell_x:cell_x + CELL_X_OFFSET, cell_y:cell_y + CELL_Y_OFFSET] = grey_matrix
+        cell_y = cell_y + CELL_Y_OFFSET
+    cell_x = cell_x + CELL_X_OFFSET
+res = Image.fromarray(img_matrix)
+correct_path = False
+while not correct_path:
+    res_path = input("Enter path to resulting image: ")
+    try:
+        res.save(res_path)
+        correct_path = True
+    except:
+        print("Incorrect path/file format, please try again")
diff --git a/res.jpg b/res.jpg
index d8d97ff..f80ca2f 100644
Binary files a/res.jpg and b/res.jpg differ