Launch the Settings app on your iPhone or iPad.
Tap on Mail, Contacts, Calendars.
Tap on Add Account... under the Mail section.
Tap on Other.
Tap on Add Subscribed Calendar under the Other section.
Enter or copy in the following address:
https://calendar.google.com/calendar/ical/cusd.kahoks.org_qi2gei1qmcklirntbdobgkoreo%40group.calendar.google.com/private-e935f978faee1ef15df945993a16c47b/basic.ics
Tap the Next button.
Tap the Save button.
That's it, the subscribed Calendar will now show up in the Calendar app.