The minimum kinetic energy needed by an alpha particle to cause the nuclear reaction ¹⁶₇N+⁴₂He→¹₁H+¹⁹₈O in a laboratory frame is n MeV. Assume ¹⁶₇N is initially at rest. The masses of ¹⁶₇N, ⁴₂He, ¹₁H and ¹⁹₈O are 16.006 u, 4.003 u, 1.008 u and 19.003 u, respectively, where 1 u=930 MeV c⁻². The value of n is _____.