A partially inflated balloon contains $500 \mathrm{~m}^{3}$ of Helium at $27^{\circ} \mathrm{C}$ and $1\text{-atm}$ pressure. What is the volume of the Helium at an altitude of $3000\rm{~m}$, where the pressure is $0.5\rm{~atm}$ and temperature is $-3^{\circ} \mathrm{C}$?