diff --git a/HW2_Mirny/README.md b/HW2_Mirny/README.md
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+# HW2_Mirny - Calculator
+
+## Description
+
+This project is Homework 2 for the "Bioinformatics Institute" bioinformatics program.
+
+The program `calculator.py` reads a mathematical expression in the format:
+`<number_1> <operator> <number_2>`
+
+
+where `<operator>` is one of: `+`, `-`, `*`, `/`.
+The program calculates the result and prints it to the screen.
+
+## Examples
+5 - 3 -> 2
+
+10 / 2 -> 5.0
+
+## Team members
+
+- Mark Mirny (team lead, @head-ease08): addition  
+- Anton Goncharov (@TonyGoncharov): main, division  
+- Sergey Ilin (@SergeyIlin322): multiplication  
+- Liubov Minina (@liuminin): subtraction, README
+
+## Team call screenshot
+![Team call](./imgs/team_call.png)
+
diff --git a/HW2_Mirny/calculator.py b/HW2_Mirny/calculator.py
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+def add(a, b):
+    return a + b
+
+def mul(a, b):
+    return a * b
+
+def sub(a, b):
+    return a - b
+
+def div(a, b):
+    try:
+        return a / b
+    except ZeroDivisionError:
+        return('Error! Zero division!')
+
+def main():
+    expr = input('Enter expression.\n').strip()
+    a_str, op, b_str = expr.split()
+
+    try:
+        a, b = float(a_str), float(b_str)
+    except ValueError:
+        print('Error: You must enter numbers.')
+        return
+    
+    if op == '+':
+        result = add(a, b)
+    elif op == '-':
+        result = sub(a, b)
+    elif op == '*':
+        result = mul(a, b)
+    elif op == '/':
+        result = div(a, b)
+    else:
+        result = 'Unsupported operator. Only one of: + - * /'
+    
+    print(result)
+
+if __name__ == "__main__":
+    main()
diff --git a/HW2_Mirny/imgs/team_call.png b/HW2_Mirny/imgs/team_call.png
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