diff --git a/app/cafe.py b/app/cafe.py
new file mode 100644
index 00000000..07d44e3a
--- /dev/null
+++ b/app/cafe.py
@@ -0,0 +1,22 @@
+import datetime
+from app.errors import (
+    NotVaccinatedError,
+    OutdatedVaccineError,
+    NotWearingMaskError
+)
+
+
+class Cafe:
+
+    def __init__(self, name: str) -> None:
+        self.name = name
+
+    def visit_cafe(self, visitor: dict) -> str:
+        current_date = datetime.date.today()
+        if "vaccine" not in visitor:
+            raise NotVaccinatedError("Visitor is not vaccinated")
+        if visitor["vaccine"]["expiration_date"] < current_date:
+            raise OutdatedVaccineError("Date of vaccination is expired")
+        if visitor["wearing_a_mask"] is False:
+            raise NotWearingMaskError("Visitor should Wear a Mask")
+        return f"Welcome to {self.name}"
diff --git a/app/errors.py b/app/errors.py
new file mode 100644
index 00000000..fb16164d
--- /dev/null
+++ b/app/errors.py
@@ -0,0 +1,14 @@
+class VaccineError(Exception):
+    pass
+
+
+class NotVaccinatedError(VaccineError):
+    pass
+
+
+class OutdatedVaccineError(VaccineError):
+    pass
+
+
+class NotWearingMaskError(Exception):
+    pass
diff --git a/app/main.py b/app/main.py
index fa56336e..e576eb2b 100644
--- a/app/main.py
+++ b/app/main.py
@@ -1 +1,25 @@
-# write your code here
+from app.cafe import Cafe
+from app.errors import (
+    NotWearingMaskError,
+    OutdatedVaccineError,
+    NotVaccinatedError
+)
+
+
+def go_to_cafe(friends: list, cafe: Cafe) -> str:
+    count_friends = 0
+    dont_vaccinated = 0
+    for friend in friends:
+        try:
+            cafe.visit_cafe(friend)
+        except (OutdatedVaccineError, NotVaccinatedError):
+            dont_vaccinated += 1
+        except NotWearingMaskError:
+            count_friends += 1
+
+    if dont_vaccinated > 0:
+        return "All friends should be vaccinated"
+    if count_friends > 0:
+        return f"Friends should buy {count_friends} masks"
+
+    return f"Friends can go to {cafe.name}"