Олимпиадный тренинг

Задача 39656. Error


The value of an arithmetic expression
\(25^{4848} - 2\cdot25 ^{4090}- 2\cdot5^{4556}- 4 \cdot 5^{2276}-5^{4404} -5^{4313}+13320\)
written in the number system with base 5. How many adjacent pairs of numbers "41" contained in this post?