diff --git a/HW2_Senkovenko/README.md b/HW2_Senkovenko/README.md
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+# Калькулятор / Calculator
+
+#### _**HomeWork №2.**_
+
+
+## Description
+
+The calculator is written in Python and performs basic arithmetic operations.
+
+Function  | Description | Contributor
+----------------|------------|----------
+main()| program loop, input/output, error handling | Alexey Senkovenko (lead)
+addition(val1, val2) | val1 + val2 | Alisa Senko
+subtraction(val1, val2)| val1 - val2 | Aglaya Tsidulko 
+division(val1, val2) | val1 / val2 | Anastasiia Kolos
+multiplication(val1, val2)| val1 * val2 | Elizaveta Menshikova
+
+README.md - main text by Alisa Senko, en-translation by Alexey Senkovenko.
+
+## How to run the script
+The script is launched from the console. 
+
+1. Clone the repository:
+```
+git clone <URL>
+```
+2. Go to the project folder and run the script:
+```
+python3 calculator.py 
+```
+or
+```
+python calculator.py
+```
+depending on your OS.
+
+### _Example_
+```
+> python calculator.py
+Hello! 
+Type exit to finish calculations
+Enter your expression:
+> 3 * 15
+Result: 45.0
+Enter your expression:
+> 3 / 0
+Math Error: Cannot divide by zero
+Enter your expression:
+> 3 + 15.4
+Result: 18.4
+Enter your expression: 
+> 3.0 + 3.9
+Result: 6.9
+```
+### _Error handling:_
+* Input-check that exactly 3 elements are given, separated by a space - two numbers and an operator:
+```
+Enter your expression: 
+> 2 +
+Value Error: Incorrect number of values, check your input: value1 operator value2
+Enter your expression: 
+> 2+3
+Value Error: Incorrect number of values, check your input: value1 operator value2
+```
+* Division by zero:
+```
+Enter your expression: 
+> 3 / 0
+Math Error: Cannot divide by zero
+```
+* Check for the correct input format:
+```
+Enter your expression: 
+> 3,5 + 3,5
+Value Error: could not convert string to float: '3,5'
+Enter your expression: 
+> 4.0 ++ 5
+Key Error: "Used unknown operator, supported operators are: ('+', '-', '*', '/')"
+Enter your expression: 
+> - - 3
+Value Error: could not convert string to float: '-'
+```
+* Unexpected Error
+
+### _How to end the calculations_
+To finish your work, type `exit` in the input field :
+```
+Enter your expression: 
+> exit
+Program closed
+```
+
+## ✨✨Our team!✨✨
+
+![alt text](imgs_Senkovenko/photo_2025-09-18_20-48-29.jpg)
diff --git a/HW2_Senkovenko/calculator.py b/HW2_Senkovenko/calculator.py
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+def subtraction(val1, val2):
+    return val1 -  val2
+
+def addition(val1, val2):
+    return val1 + val2
+
+def multiplication(val1, val2):
+    return val1 * val2
+
+def division(val1, val2):
+    if val2 == 0:
+        raise ZeroDivisionError("Cannot divide by zero")
+    return val1 / val2
+
+
+operators = {
+    '+': addition,
+    '-': subtraction,
+    '*': multiplication,
+    '/': division
+}
+
+def main():
+    print("Hello! \nType exit to finish calculations")
+
+    while True:
+        check = input("Enter your expression: \n")
+        
+        if "exit" in check:
+            print("Program closed")
+            break
+
+        try:
+            line = check.split()    
+            
+            if len(line) != 3:
+                raise ValueError("Incorrect number of values, check your input: value1 operator value2")
+                
+            val1 = float(line[0])
+            oper = line[1]
+            val2 = float(line[2])
+
+            if oper not in operators:
+                raise KeyError (f"Used unknown operator, supported operators are: {tuple(operators.keys())}")
+
+            result = operators[oper](val1, val2)
+
+            print(f"Result: {result}")
+
+        except ValueError as valerr:
+            print(f"Value Error: {valerr}")
+        except KeyError as keyerr:
+            print(f"Key Error: {keyerr}")
+        except ZeroDivisionError as zeroerr:
+            print(f"Math Error: {zeroerr}")
+        except Exception as exc:
+            print(f"Unexpected Error: {exc}")
+
+if __name__ == "__main__":
+    main()
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