A galaxy is moving away from the earth at a speed of $286 \mathrm{kms}^{-1}$. The shift in the wavelength of a red line at 630 nm is $\times \times 10^{-10} \mathrm{~m}$. The value of x , to the nearest integer, is $\_\_\_\_$ . [Take the value of speed of light c , as $3 \times 10^8 \mathrm{~ms}^{-1}$ ]