diff --git a/hometask7/task1.py b/hometask7/task1.py
new file mode 100644
index 0000000..5934b8a
--- /dev/null
+++ b/hometask7/task1.py
@@ -0,0 +1,44 @@
+#!/usr/bin/env python
+# nevl 2021
+
+class Matrix:
+
+    def __init__(self, data):
+        if not type(data) is list or not type(data[0]) is list:
+            print('Not a matrix. Try again')
+            return
+
+        self.matrix_data = data
+
+    def __str__(self):
+        result = ''
+        for iter in self.matrix_data:
+            s = '['
+            for item in iter:
+                s += f'{item}\t'
+            result += f'{s}]\n'
+        return result
+
+    def __add__(self, other):
+        data = list()
+        # check shape
+        if len(self.matrix_data) != len(other.matrix_data) or len(self.matrix_data[0]) != len(other.matrix_data[0]):
+            return None
+
+        # calculate
+        for i in range(len(self.matrix_data)):
+            data.append(list())
+            for j in range(len(self.matrix_data[0])):
+                data[i].append(self.matrix_data[i][j] + other.matrix_data[i][j])
+
+        return Matrix(data)
+
+
+if __name__ == '__main__':
+    mart1 = Matrix([[1, 2, 3], [3, 4, 5]])
+    print(mart1)
+
+    mart2 = Matrix([[1.1, 2.2, 3.3], [3.3, 4.4, 5.5]])
+    print(mart2)
+
+    print(mart1 + mart2)
diff --git a/hometask7/task2.py b/hometask7/task2.py
new file mode 100644
index 0000000..665b8af
--- /dev/null
+++ b/hometask7/task2.py
@@ -0,0 +1,44 @@
+#!/usr/bin/env python
+# nevl 2021
+
+from abc import ABC, abstractmethod
+
+
+class dress(ABC):
+
+    def __init__(self, size):
+        self.size = size
+
+    @abstractmethod
+    def cloth_rate(self):
+        pass
+
+
+class coat(dress):
+
+    @property
+    def cloth_rate(self):
+        return self.size / 6.5 + 0.5
+
+
+class suit(dress):
+
+    @property
+    def cloth_rate(self):
+        return self.size * 2 + 0.3
+
+
+if __name__ == '__main__':
+    c1 = coat(50)
+    print(c1.cloth_rate)
+
+    s1 = suit(1.75)
+    print(s1.cloth_rate)
+
+    c2 = coat(54)
+    print(c2.cloth_rate)
+
+    s2 = suit(1.85)
+    print(s2.cloth_rate)
+
+    print(f'Cloth for all dresses = {s1.cloth_rate + s2.cloth_rate + c1.cloth_rate + c2.cloth_rate}')
diff --git a/hometask7/task3.py b/hometask7/task3.py
new file mode 100644
index 0000000..c7e9072
--- /dev/null
+++ b/hometask7/task3.py
@@ -0,0 +1,50 @@
+#!/usr/bin/env python
+# nevl 2021
+
+class Cell:
+
+    def __init__(self, count):
+        self.count = count
+
+    def __add__(self, other):
+        return Cell(self.count + other.count)
+
+    def __sub__(self, other):
+        t = self.count - other.count
+        if t < 0:
+            raise OverflowError
+        return Cell(t)
+
+    def __mul__(self, other):
+        return Cell(self.count * other.count)
+
+    def __truediv__(self, other):
+        return Cell(self.count // other.count)
+
+    def make_order(self, line_count):
+        s = ''
+        for _ in range(self.count // line_count):
+            s += '*'*line_count + '\n'
+        s += '*'*(self.count % line_count) + '\n'
+        return s
+
+
+if __name__ == '__main__':
+    cell1 = Cell(31)
+    cell2 = Cell(35)
+    cell3 = Cell(27)
+
+    for it in [cell1, cell2, cell3]:
+        print(it.make_order(9))
+
+    try:
+        cell4 = cell1 - cell2
+        print(cell4.make_order(9))
+    except:
+        print('Error')
+
+    try:
+        cell5 = cell2 - cell3
+        print(cell5.make_order(9))
+    except:
+        print('Error')