what are the final pressures of each gas when the reaction

the reaction:H2(g) I2(g) to 2HI(g) has an equilibrium constant of K=54.4 at 355 degrees (C). At 355 degrees (C) and a total pressure of 0.5 atm what are the final pressures of each gas when the reaction reaches equilibrium? (Assume you have no HI initially”