diff --git a/.flake8 b/.flake8
index d7459204..99d2e123 100644
--- a/.flake8
+++ b/.flake8
@@ -4,4 +4,4 @@ ignore = E203, E266, W503, ANN002, ANN003, ANN101, ANN102, ANN401, N807, N818
 max-line-length = 79
 max-complexity = 18
 select = B,C,E,F,W,T4,B9,ANN,Q0,N8,VNE
-exclude = venv, tests
+exclude = .venv, tests
diff --git a/app/main.py b/app/main.py
index 6d375672..f80faed5 100644
--- a/app/main.py
+++ b/app/main.py
@@ -1,25 +1,72 @@
 from abc import ABC
+from typing import Any, Type
 
 
 class IntegerRange:
-    pass
+    def __init__(self, min_amount: int, max_amount: int) -> None:
+        self.min_amount = min_amount
+        self.max_amount = max_amount
+
+    def __set_name__(self, owner: Type, name: str) -> None:
+        self.protected_name = "_" + name
+
+    def __get__(self, instance: Any, owner: Type) -> int:
+        return getattr(instance, self.protected_name)
+
+    def __set__(self, instance: Any, value: Any) -> None:
+        if not isinstance(value, int):
+            raise TypeError("Value must be an integer.")
+        if not (self.min_amount <= value <= self.max_amount):
+            raise ValueError(f"Value must be between {self.min_amount} "
+                             f"and {self.max_amount}.")
+        setattr(instance, self.protected_name, value)
 
 
 class Visitor:
-   pass
+    def __init__(
+            self,
+            name: str,
+            age: int,
+            weight: int,
+            height: int
+    ) -> None:
+        self.name = name
+        self.age = age
+        self.weight = weight
+        self.height = height
 
 
 class SlideLimitationValidator(ABC):
-    pass
+    def __init__(self, age: int, weight: int, height: int) -> None:
+        self.age = age
+        self.weight = weight
+        self.height = height
 
 
 class ChildrenSlideLimitationValidator(SlideLimitationValidator):
-    pass
+    age = IntegerRange(4, 14)
+    weight = IntegerRange(20, 50)
+    height = IntegerRange(80, 120)
 
 
 class AdultSlideLimitationValidator(SlideLimitationValidator):
-    pass
+    age = IntegerRange(14, 60)
+    weight = IntegerRange(50, 120)
+    height = IntegerRange(120, 220)
 
 
 class Slide:
-    pass
+    def __init__(
+            self,
+            name: str,
+            limitation_class: Type[SlideLimitationValidator]
+    ) -> None:
+        self.name = name
+        self.limitation_class = limitation_class
+
+    def can_access(self, visitor: Visitor) -> bool:
+        try:
+            self.limitation_class(visitor.age, visitor.weight, visitor.height)
+        except (TypeError, ValueError):
+            return False
+        return True