diff --git a/app.py b/app.py
index 749ccbf..5477a79 100644
--- a/app.py
+++ b/app.py
@@ -5,6 +5,13 @@ from icalendar.cal import Calendar, Component
 
 app = Flask(__name__)
 
+FILTERED_COURSES = os.environ.get('COURSES', '').split(',')
+FILTERED_TYPES = os.environ.get('TYPES', '').split(',')
+YEAR = int(os.environ.get('YEAR', '4'))
+GROUP = int(os.environ.get('GROUP', '1'))
+GENERAL_GROUP = int(os.environ.get('GENERAL_GROUP', '0'))
+GROUPS = [GROUP, GENERAL_GROUP]
+
 
 @app.route("/")
 def hello():
@@ -14,8 +21,6 @@ def hello():
 
     cal_str = urllib.request.urlopen(url).read()
 
-    FILTERED_EVENTS = os.environ.get('COURSES', '').split(',')
-
     cal = Component.from_ical(cal_str)
     other = Calendar()
 
@@ -28,12 +33,25 @@ def hello():
 
     # Filter and copy VEVENTs
     for ev in cal.walk('VEVENT'):
-        course_code = ev['SUMMARY'].split('-')[1].split('/')[0]
-        if course_code not in FILTERED_EVENTS:
+        if should_add(ev):
             other.add_component(ev)
 
     return other.to_ical().replace(b'\r\n', b'\n').strip()
 
+
+def should_add(event):
+    course_code = event['SUMMARY'].split('-')[1].split('/')[0]
+    course_type = event['SUMMARY'].split('/')[1].split('_')[1]
+    year = event['SUMMARY'][0]
+    group = event['SUMMARY'][-1]
+
+    return \
+        course_code not in FILTERED_COURSES \
+        and course_type not in FILTERED_TYPES \
+        and year == YEAR \
+        and group in GROUPS
+
+
 if __name__ == "__main__":
     port = int(os.environ.get('PORT', 5000))
     app.run('0.0.0.0', port)