A monitoring program uses the following code to validate the pressure differential in an extraction system:
01 pressure = int(input("Enter pressure differential in Pa: "))
02 if pressure < -45:
03 print("System unstable: Pressure too low")
04 else:
05 print("System pressure within normal parameters")
State the largest integer the user could enter on line 01 to cause the message 'System unstable: Pressure too low' to be displayed.