In a particular system of units, a physical quantity can be expressed in terms of the electric charge \( e \), electron mass \( m_e \), Planck’s constant \( h \), and Coulomb’s constant \( k = \dfrac{1}{4\pi \varepsilon_0} \), where \( \varepsilon_0 \) is the permittivity of vacuum. In terms of these physical constants, the dimension of the magnetic field is \( [B] = [e]^{\alpha}[m_e]^{\beta}[h]^{\gamma}[k]^{\delta} \). The value of \( \alpha + \beta + \gamma + \delta \) is ____.
