A dual$-$slope integrating ADC includes a voltage reference $V_{\text{r}\text{e}\text{f}}$ of $2\mathrm{.}50000$ volts and a clock with $1s$ 'ticks'. The voltage to be converted, $V_{in},$ is applied to the integrator for exactly $500,000$ 'ticks' of the clock. $V_{\text{r}\text{e}\text{f}}$ is then applied, and deintegration takes $263,456$ ticks of the clock. Calculate $V_{in}.$