At a certain temperature, the equilibrium constant Kc

At a certain temperature, the equilibrium constant Kc for this reaction is 53.3H2 + I2 —> 2HI at this temperature, 0.800 mol of H2 AND .800 mol of I2 were placed in 1.00L container to react.
What concentration of HI is present at equilibrium?[HI]= ?M