Okay kiddo, the Gross-Koblitz formula is a way of doing math problems involving large numbers. Sometimes when we do math with big numbers, it can take a really long time to figure out the answer. But the Gross-Koblitz formula helps us find the answer faster!
Here's how it works: first we need to pick two special big numbers, and we call them "P" and "A". Then we pick another big number "N" that we want to do math with.
Next, we use some fancy math tricks (like something called "modular arithmetic") to figure out two more big numbers, which we call "X" and "Y". These numbers will help us calculate the final answer.
Finally, we use a formula that involves P, A, N, X, and Y to find the answer to our math problem. And because we used the Gross-Koblitz formula to do it, we can find the answer much faster than if we tried to do the math without it!
So basically, the Gross-Koblitz formula is a fast way to do math with big numbers, by using some special tricks and following a certain formula. Pretty cool, huh?