diff --git a/HW2_Stepanova/.gitignore b/HW2_Stepanova/.gitignore
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+.DS_Store/
diff --git a/HW2_Stepanova/README.md b/HW2_Stepanova/README.md
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+# About calculator
+
+A calculator is a program that performs basic arithmetic operations: addition, subtraction, multiplication and division. The calculator takes as input ( ) a string with some mathematical expression and prints a number - the result of calculating this expression.
+
+# Requirements
+
+Python 3.x (tested on Python 3.8 and above).
+
+# Team
+
+Shchekuteva Ekaterina, Revyakina Lilia, Loginova Olga, Stepanova Arina.
+
+# Citation
+
+;) If you use calculator in your work, please cite [https://github.com/arrstepa/HW2_Stepanova].
+
+# Feedback and bug reports
+
+If you have any troubles running calculator, please attach params.txt and calculator.log :)
+
+# Screenshot of the team meeting
+
+![](imgs/screenshot.jpg)
diff --git a/HW2_Stepanova/calculator.py b/HW2_Stepanova/calculator.py
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+def multiple(a,b):
+	"Функция умножения двух чисел"
+	return a*b
+
+def substraction(a, b):
+	"Функция вычитания b из a"
+	return a - b
+
+def addition (a, b):
+	"Функция сложения двух чисел"
+	return a + b
+
+def division (a, b):
+	"Функция деления a на b"
+	if b!= 0:
+		return a/b
+	else:
+		return "деление на 0!"
+
+def main():
+    exp=input("Введите выражение: ").split()
+    a,operation,b = float(exp[0]), exp[1], float(exp[2])
+    if operation == "+":
+        print(addition(a,b))
+    elif operation == "-":
+        print(substraction(a,b))
+    elif operation == "*":
+        print(multiple(a,b))
+    else:
+        print(division(a,b))
+
+main()
diff --git a/HW2_Stepanova/imgs/screenshot.jpg b/HW2_Stepanova/imgs/screenshot.jpg
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