First, what turns on the second page? I don't see any switches set.
What I would do is how it seems you've started. You have your variable. Each time you find a key it adds 1 to the variable. When the variable is equal to 3, have the conditional branch turn on a self-switch. Make sure to set the second page to turn on with the self-switch.
How do you have your variable set up, because it looks like you may have a separate variable for each key? If that's the case, you would need to have the condition of each variable met, not just the one.