3. Calculate the sum: $\frac{1 \cdot 2019!}{2019!}+\frac{2 \cdot 2019!}{1!\cdot 2018!}+\frac{4 \cdot 2019!}{2!\cdot 2017!}+\frac{8 \cdot 2019!}{3!\cdot 2016!}+\ldots+\frac{2^{2018} \cdot 2019!}{2018!\cdot 1!}+\frac{2^{2019} \cdot 2019!}{2019!}$
Answer: $3\wedge2019$

To denote the power, use the caret symbol $\wedge$.

Examples of answer notation: $390625,5\wedge8$

For input, digits and the caret for denoting powers are allowed

#