diff --git a/group_ids_downloader.py b/group_ids_downloader.py
new file mode 100644
index 0000000..cda13fe
--- /dev/null
+++ b/group_ids_downloader.py
@@ -0,0 +1,33 @@
+#!/usr/bin/python3
+# -*- coding: utf-8 -*- 
+'''
+group_ids_downloader.py VK_LOGIN VK_PASSWORD APP_ID INPUT_FILENAME
+where INPUT_FILENAME is file with one id of group per line
+'''
+import sys
+
+import vk_api
+
+def getIdsByGroup(group_id):
+    ids = []
+    res = vk.method("groups.getMembers", {"group_id":group_id,"count":1000})
+    count = res['count'] - 1000
+    ids += res['items']
+    cur_offset = 1000
+    while count > 0:
+        res = vk.method("groups.getMembers", {"group_id":group_id,
+            "count":1000,"offset":cur_offset, "sort":"id_asc"})
+        count = count - 1000
+        cur_offset += 1000
+        ids += res['items']
+    return ids
+
+vk_login, vk_password = sys.argv[1], sys.argv[2]
+vk = vk_api.VkApi(vk_login, vk_password, app_id=sys.argv[3])
+
+vk.authorization()
+
+for group_id in open(sys.argv[4]):
+    group_id = group_id.strip()
+    good_ids = getIdsByGroup(group_id)
+    open('out/' + str(group_id),'w').write('\n'.join([str(i) for i in good_ids]))