diff --git a/homeworks/25_Stanislav_Ivanov/01_check_circles.py b/homeworks/24_Stanislav_Ivanov/01_check_circles.py
similarity index 100%
rename from homeworks/25_Stanislav_Ivanov/01_check_circles.py
rename to homeworks/24_Stanislav_Ivanov/01_check_circles.py
diff --git a/homeworks/24_Stanislav_Ivanov/02_avg_brightness.py b/homeworks/24_Stanislav_Ivanov/02_avg_brightness.py
new file mode 100644
index 0000000..5ff9dab
--- /dev/null
+++ b/homeworks/24_Stanislav_Ivanov/02_avg_brightness.py
@@ -0,0 +1,42 @@
+def calculate_area(lst: list[list[int]], row: int, col: int) -> tuple[int, int]:
+    if row not in range(len(lst)) or col not in range(len(lst)):
+        return 0, 0
+    if lst[row][col] == 0:
+        return 0, 0
+
+    sum_ = lst[row][col]
+    lst[row][col] = 0
+    pixels = 1
+
+    for i in range(row-1, row+2):
+        for j in range(col-1, col+2):
+            if i == row and j == col:
+                continue
+            pixels_to_add, sum_to_add = calculate_area(lst, i, j)
+            pixels += pixels_to_add
+            sum_ += sum_to_add
+
+    return pixels, sum_
+
+
+def avg_brightness(given_list: list) -> None:
+    lst = given_list.copy()
+    for index_row, row in enumerate(lst):
+        for index_col, element in enumerate(row):
+            if element == 0:
+                continue
+
+            pixels, sum_ = calculate_area(lst, index_row, index_col)
+            print(f"({index_row}, {index_col}) {(sum_/pixels):.2f}")
+
+
+if __name__ == "__main__":
+    test_list = [
+        [170, 0, 0, 255, 221, 0],
+        [68, 0, 17, 0, 0, 68],
+        [221, 0, 238, 136, 0, 255],
+        [0, 0, 85, 0, 136, 238],
+        [238, 17, 0, 68, 0, 255],
+        [85, 170, 0, 221, 17, 0]
+    ]
+    avg_brightness(test_list)
diff --git a/homeworks/24_Stanislav_Ivanov/03_ladder.py b/homeworks/24_Stanislav_Ivanov/03_ladder.py
new file mode 100644
index 0000000..826ff0b
--- /dev/null
+++ b/homeworks/24_Stanislav_Ivanov/03_ladder.py
@@ -0,0 +1,18 @@
+def num_ways(steps: int) -> int:
+    if type(steps) is not int:
+        raise TypeError("n must be an integer")
+
+    if steps <= 2:
+        return max(0, steps)
+    return num_ways(steps-1) + num_ways(steps-2)
+
+
+if __name__ == "__main__":
+    print(num_ways(2))
+    print(num_ways(3))
+    print(num_ways(4))
+    print(num_ways(-3))
+    try:
+        print(num_ways("5"))
+    except TypeError as error:
+        print(error)
diff --git a/homeworks/24_Stanislav_Ivanov/04_replace.py b/homeworks/24_Stanislav_Ivanov/04_replace.py
new file mode 100644
index 0000000..56ecb86
--- /dev/null
+++ b/homeworks/24_Stanislav_Ivanov/04_replace.py
@@ -0,0 +1,20 @@
+from typing import Any
+
+
+def replace(element: Any, find: str, replace_: str) -> Any:
+    if element == find:
+        return replace_
+    element_type = type(element)
+    try:
+        if type(element) is str:
+            return element
+        element = list(element)
+        for index in range(len(element)):
+            element[index] = replace(element[index], find, replace_)
+    finally:
+        return element_type(element)
+
+
+if __name__ == "__main__":
+    test_list = [1, "2", 3, "45", "7", [1, "2"], (1, ["2", "34"], 3, "2")]
+    print(replace(test_list, "2", "99"))