Apply QR factorization on A so that $A = QR$, where Q is an orthogonal matrix, and R is an upper triangular matrix. "K" is equal to multiplying all the nonzero elements in R. What is $\text{mod}(\text{round}(|K|), 5)$, where $\text{round}(\cdot)$ is the rounding function (to the nearest integer), and $\text{mod}(\cdot)$ is the modulo operator?