diff --git a/README.md b/README.md
index e93444f..b43c084 100644
--- a/README.md
+++ b/README.md
@@ -2,6 +2,11 @@
 
 Темы: Git и GitHub, стандарты оформления кода, хорошие практики, тестирование.
 
+Фамилия, имя: Бугаев Илья
+
+Группа: 25.Б-42
+
+
 ## Этапы выполнения работы
 
 - Сделать **fork** этого репозитория
diff --git a/src/__pycache__/checksum.cpython-312.pyc b/src/__pycache__/checksum.cpython-312.pyc
new file mode 100644
index 0000000..59c8d2e
Binary files /dev/null and b/src/__pycache__/checksum.cpython-312.pyc differ
diff --git a/src/bin_search.py b/src/bin_search.py
index 713abfc..3249226 100644
--- a/src/bin_search.py
+++ b/src/bin_search.py
@@ -1,6 +1,6 @@
-def binSearch(xs: list[int], x: int):
+def bin_search(xs: list[int], x: int):
     left, right = 0, len(xs) - 1
-    while left < right:
+    while left <= right:
         mid = (left + right) // 2
         if xs[mid] == x:
             return mid
diff --git a/src/checksum.py b/src/checksum.py
index 74b4fb0..5905eb9 100644
--- a/src/checksum.py
+++ b/src/checksum.py
@@ -1,14 +1,28 @@
-def modulo11Checksum(ISBNNumber: str):
+def modulo11_checksum(is_bn_number: str):
 
-    digits = [int(char) for char in ISBNNumber if char.isdigit()]
+    if not isbn_number or not isinstance(isbn_number, str):
+        raise ValueError("Invalid input: must be non-empty string")
+    
 
-    checkDigit = digits[-1]
+    digits = [int(char) for char in is_bn_number if char.isdigit()]
+
+    check_digit = digits[-1]
 
     total = 0
     for i in range(len(digits) - 1):
-        weight = 10
+        weight = 10 - i
         digit = digits[i]
         total += digit * weight
 
-    checksum = total + checkDigit
-    return checksum % 11 == 0
+    checksum = total % 11
+    return checksum == check_digit
+
+
+while True:
+    isbn = input("ISBN: ").strip()
+    if isbn == "-1":
+        break
+    if check_isbn(isbn):
+        print("correct")
+    else:
+        print("incorrect")
diff --git a/test/__pycache__/test_checksum.cpython-312-pytest-8.4.2.pyc b/test/__pycache__/test_checksum.cpython-312-pytest-8.4.2.pyc
new file mode 100644
index 0000000..a98ba6c
Binary files /dev/null and b/test/__pycache__/test_checksum.cpython-312-pytest-8.4.2.pyc differ
diff --git a/test/test_bin_searh.py b/test/test_bin_searh.py
index d18d85b..b513ef9 100644
--- a/test/test_bin_searh.py
+++ b/test/test_bin_searh.py
@@ -1,13 +1,21 @@
-from src.bin_search import binSearch
+from src.bin_search import bin_search
 
 
 def test_middle():
-    assert binSearch([1, 2, 3, 4, 5], 4) == 3
+    assert bin_search([1, 2, 3, 4, 5], 3) == 2
 
 
 def test_start():
-    assert binSearch([1, 2, 3, 4], 2) == 1
+    assert bin_search([1, 2, 3, 4], 1) == 0
+    assert bin_search([1, 2, 3, 4], 2) == 1
+
+
+def test_end():
+    assert bin_search([1, 2, 3, 4, 5], 5) == 4
+    assert bin_search([1, 2, 3, 4], 4) == 3
 
 
 def test_not_in_list():
-    assert binSearch([1, 2, 3, 4], 5) == -1
+    assert bin_search([1, 2, 3, 4], 5) == -1
+    assert bin_search([1, 2, 3, 4], 0) == -1
+    assert bin_search([1, 2, 3, 4], 6) == -1
diff --git a/test/test_checksum.py b/test/test_checksum.py
index f64a64c..3eae4ad 100644
--- a/test/test_checksum.py
+++ b/test/test_checksum.py
@@ -1,9 +1,20 @@
-from src.checksum import modulo11Checksum
+from src.checksum import modulo11_checksum
 
+def test_valid_isbn10_with_hyphens():
+    #Тесты с дефисами
+    assert modulo11_checksum("2-266-11156-8")
+    assert modulo11_checksum("0-7475-3269-9")
+    assert modulo11_checksum("1-56619-909-3")
 
-def test_good():
-    assert modulo11Checksum("2-266-11156-8")
 
+def test_valid_isbn10_without_hyphens():
+    #Тест без дефисов
+    assert modulo11_checksum("2266111568")
+    assert modulo11_checksum("0747532699")
+    assert modulo11_checksum("1566199093")
 
-def test_bad():
-    assert not modulo11Checksum("2-266-11156-3")
+def test_invalid_isbn10():
+    #Тесты невалидности
+    assert not modulo11_checksum("2-266-11156-3")
+    assert not modulo11_checksum("0-7475-3269-8")
+    assert not modulo11_checksum("1566199095")