In the circuit, ammeter $A_2$ reads $2.0~\mathrm{A}$. All components are considered ideal.

С1  ^4.00 Find the reading of ammeter $A_1$ given that the resistors have resistances of $1~\Omega$, $2\Omega$, $3 \Omega$, $4 \Omega$, and voltmeter $V$ shows a voltage of $10~\mathrm{V}$.