2020 AMC 10B Problem 1

What is the value of $1 - (-2) - 3 - (-4) - 5 - (-6)?$

$\textbf{(A)}\ -20 \qquad\textbf{(B)}\ -3 \qquad\textbf{(C)}\ 3 \qquad\textbf{(D)}\ 5 \qquad\textbf{(E)}\ 21$

Full credit goes to MAA for authoring these problems. These problems were taken on the AOPS website.