Physics Question from JEE Main 2023 · 30 January, Shift 2

As shown in figure, a cuboid lies in a region with electric field $\mathbf{E} = 2x^2 \hat{i} - 4y \hat{j} + 6 \hat{k}$ N/C. The magnitude of charge within the cuboid is $n \epsilon_0$ C. The value of $n$ is _____ (if dimensions of cuboid are $1 \times 2 \times 3 \, \text{m}^3$)