A company has rented the store for 25 days.

- The first day they have earned €1 by their store.
- The second day they earned €4 by their store.
- The third day they earned €9.
- And so on until the 25th day.

So the earnings on day \(x\) is €\(x^2\).

If they have saved all the money from the first day until the 25th day, how much money they have now?

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