In an atmosphere, temperature (T) decreases linearly with height above the ground (z), i.e., T(z) = T\(_0\) - \(\gamma\)z, where \(\gamma\) is a constant. Surface pressure is 900 hPa. If the atmosphere is at rest, then the value of z at which the pressure decreases to half of that at the surface is \(\underline{\hspace{2cm}}\) m (rounded off to the nearest integer).