diff --git a/.gitignore b/.gitignore
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+.idea/*
diff --git a/HW2_nekrasova/README.md b/HW2_nekrasova/README.md
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+# Basic calculator
+*This repo is for the 2nd homework of Python 2023 course*
+
+### Calculator description
+This branch (HW2_nekrasova) contains calculator.py script designed to operate with two numbers via one of the following basic mathematical functions: addition, subtraction, multiplication, division.
+Right after start script waits for the user to enter a mathematical expression like '2 * 2'. Expression is then splitted by spaces and calculated corresponding to function according to the specified operator.
+The script handles both int and float types of numbers. It also handles devision by 0.
+
+### Installation
+Calculator is a straight forward script that does not need any prerequisites apart from installed Python 3. To get started use your CLI and execute the following commandlet: `python3 calculator.py`.
+After this the script is ready to recieve your mathematical expression.
+
+### Development
+This project is leaded by nekrasovadasha22 with contributions from the following people: 
+- grishchenkoira
+- anisssum
+- NSapozhnikov
+- Komarov I.
+
+Feel free to report any bugs encountered to nekrasovadasha22.
+![photo_2023-09-13_19-43-30](https://github.com/nekrasovadasha22/HW2_Git_and_python/assets/144455860/d11f2906-21e0-4eda-9849-b58d64b312c8)
diff --git a/HW2_nekrasova/calculator.py b/HW2_nekrasova/calculator.py
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+def main(expression: str):
+    expression_array = expression.split(' ')
+    array_of_operands = []
+
+    try:
+        left_int = int(expression_array[0])
+        array_of_operands.append(left_int)
+    except:
+       left_float = float(expression_array[0])
+       array_of_operands.append(left_float)
+
+
+    try:
+        right_int = int(expression_array[2])
+        array_of_operands.append(right_int)
+    except:
+       right_float = float(expression_array[2])
+       array_of_operands.append(right_float)
+
+    answer = None
+
+    if expression_array[1] == '+':
+        answer = add(array_of_operands)
+
+    elif expression_array[1] == '-':
+        answer = substruct(array_of_operands)
+       
+    elif expression_array[1] == '*':
+        answer = multiple(array_of_operands)
+    elif expression_array[1] == '/':
+        answer = divide(array_of_operands)
+
+    print(answer)
+
+
+def add(arr_of_operands: list):
+    return arr_of_operands[0]+arr_of_operands[1]
+
+def substruct(arr_of_operands: list):
+    # substruct
+    return arr_of_operands[0]-arr_of_operands[1]
+
+
+def multiple(arr_of_operands: list):
+    answer = arr_of_operands[0] * arr_of_operands[1]
+    return answer
+
+
+def divide(arr_of_operands: list):
+    if arr_of_operands[1] != 0:
+        answer = arr_of_operands[0]/arr_of_operands[1]
+        return answer
+    else:
+        answer = 'Деление на 0!'
+    return answer
+
+
+
+
+current_expression = input()
+main(current_expression)
+