diff --git a/.github/workflows/ruff.yml b/.github/workflows/ruff.yml
new file mode 100644
index 0000000..8f69dff
--- /dev/null
+++ b/.github/workflows/ruff.yml
@@ -0,0 +1,30 @@
+name: Ruff
+
+on: 
+  push:
+
+jobs:
+  ruff:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+        with:
+          fetch-depth: 0
+      
+      - name: Get changed Python files
+        id: changed-files
+        run: |
+          CHANGED_FILES=$(git diff --name-only HEAD~1 HEAD | grep '\.py$' | tr '\n' ' ' || true)
+          echo "changed_files=$CHANGED_FILES" >> $GITHUB_OUTPUT
+          echo "Changed Python files: $CHANGED_FILES"
+      
+      - name: Run Ruff on changed files
+        if: steps.changed-files.outputs.changed_files != ''
+        uses: astral-sh/ruff-action@v3
+        with:
+          version: "0.4.4"
+          args: "check --output-format=github ${{ steps.changed-files.outputs.changed_files }}"
+      
+      - name: No Python files changed
+        if: steps.changed-files.outputs.changed_files == ''
+        run: echo "No Python files to check"
diff --git a/pyproject.toml b/pyproject.toml
new file mode 100644
index 0000000..d268a5e
--- /dev/null
+++ b/pyproject.toml
@@ -0,0 +1,18 @@
+[tool.ruff]
+target-version = "py312"
+
+[tool.ruff.lint]
+  extend-select = [
+      "F",        # Правила Pyflakes
+      "W",        # Предупреждения PyCodeStyle
+      "E",        # Ошибки PyCodeStyle
+      "I",        # Правильно сортировать импорты
+      "N",        # Нейминг
+      "UP",       # Предупреждать, если что-то можно изменить из-за новых версий Python
+      "C4",       # Ловить неправильное использование comprehensions, dict, list и т.д.
+      "FA",       # Применять from __future__ import annotations
+      "ISC",      # Хорошее использование конкатенации строк
+      "ICN",      # Использовать общие соглашения об импорте
+      "RET",      # Хорошие практики возврата
+      "SIM",      # Общие правила упрощения
+  ]
diff --git a/src/SecondHomeworks/Extended_Euclid.py b/src/SecondHomeworks/Extended_Euclid.py
index ae34594..72b195d 100644
--- a/src/SecondHomeworks/Extended_Euclid.py
+++ b/src/SecondHomeworks/Extended_Euclid.py
@@ -1,16 +1,18 @@
 def extended_gcd(a, b):
     remainder0, remainder1 = a, b
-    factorA0, factorA1 = 1, 0
-    factorB0, factorB1 = 0, 1
+    factor_a0, factor_a1 = 1, 0
+    factor_b0, factor_b1 = 0, 1
 
     while remainder1 != 0:
         quotient = remainder0 // remainder1
         remainder0, remainder1 = remainder1, remainder0 - quotient * remainder1
-        factorA0, factorA1 = factorA1, factorA0 - quotient * factorA1
-        factorB0, factorB1 = factorB1, factorB0 - quotient * factorB1
+        factor_a0, factor_a1 = factor_a1, factor_a0 - quotient * factor_a1
+        factor_b0, factor_b1 = factor_b1, factor_b0 - quotient * factor_b1
 
-    return remainder0, factorA0, factorB0
-A, B = int(input()), int(input())
-gcd, factorA, factorB = extended_gcd(A, B)
+    return remainder0, factor_a0, factor_b0
+
+
+a, b = int(input()), int(input())
+gcd, factor_a, factor_b = extended_gcd(a, b)
 print(f"GCD = {gcd}")
-print(f"({factorA}) * {A} + ({factorB}) * {B} = {gcd}")
\ No newline at end of file
+print(f"({factor_a}) * {a} + ({factor_b}) * {b} = {gcd}")