Олимпиадный тренинг

Задача 39050. Let's count the numbers - 03


The value of an arithmetic expression
\(3 \cdot 4^{47} + 4 ^{32}- 4^{25} -2 \cdot 4 ^{20}-8\)
written in the number system with base 16. How many digits 'F' contained in this post?