I just want to know if this equation for the mass defect is correct

$$\Delta m = Z * m_p + Z * m_e + N* m_n - A $$

where

• Z- Atomic number
• A- Mass number
• N- number of neutrons
• $m_p$- mass of the proton
• $m_n$- mass of the neutron
• $m_e$- mass of the electron

I came up with another formula also $$ΔM=[(Z(m_p)+N(m_n))−(M)]$$ where m is the observed mass

Which one is correct and what is the difference between both these equations.

I just want to know if this equation for the mass defect is correct

$$\Delta m = Z * m_p + Z * m_e + N* m_n - A $$

where

• Z- Atomic number
• A- Mass number
• N- number of neutrons
• $m_p$- mass of the proton
• $m_n$- mass of the neutron
• $m_e$- mass of the electron

I came up with another formula also $$ΔM=[(Z(m_p)+N(m_n))−(M)]$$ where $m$ is the observed mass

Which one is correct and what is the difference between both these equations?