Fast Friend RSR Calculator

==Calculator is out of date, update coming soon. It's still functional though. ==
This is a calculator that calculates the lowest price that a Fast Friend of each tier can be acquired for, what the setup required would be, along with the price and chance of each upgrade succeeding. It takes in either of the following:
*the total % chance of getting a Fast Friend from a vending machine,
*the amount of RSR (Red Star Rings) needed to get one - for example, if the total chance is 25% and the vending machine costs 10 RSR to use, you'd input 40 RSR (1/4 chance = 10 RSR, 4/4 chance = 40 RSR), or, for example, 0 RSR if using the Toy Robot Metal Sonic Fast Friends from the Cyber Station vending machine.
The calculator takes into account every possible combination of Fast Friends, and every possible combination of the amount of Fast Friends used for the upgrade, and gives the smallest RSR cost that it could find, taking into account how much each individual Fast Friend used would cost, as well as the cost of the upgrade attempt and the chance of the upgrade to be successful.
If you have any issues, questions or suggestions, you can post them on this discord thread! Suggestions will get added as an option (if, a bit late), that's a promise - so don't be afraid to reach out!
==Using the calculator ==
To use the calculator, simply input into the textbox the total % chance of getting one Fast Friend.
Alternatively, input the raw amount of RSR needed to get a Fast Friend, and the table below will tell you the cost, and setup, you're going to need for each upgrade.
=== Custom mode ===
If you'd like to test a specific setup, you can use the Custom Mode and input any Fast Friends you like. It will tell you the chance, and cost, of that upgrade for the tier that has been customized. If a tier wasn't customized at all, it will instead generate the best setup possible like usual.