The minimum kinetic energy needed by  ${}_7{}^{16}N$ nucleus to cause the nuclear reaction ${}_7{}^{16}N+{}_2{}^{4}He\to {}_1{}^{1}H+{}_8{}^{19}O$ in a laboratory frame is n (in MeV). Assume that the alpha particle  is at rest in laboratory frame. The masses of reaction ${}_7{}^{16}N,{}_2{}^{4}He,{}_1{}^{1}Hand{}_8{}^{19}O$ are 16.006u,  4.003u, 1.008u and 19.003u respectively where u = 930MeV/$c^2$. The value of n is close to _________