How do I add additional sensors?

Projects Programming
14 
sensorPinValue = analogRead(sensorPin1);
sensorPinValue = analogRead(sensorPin2);
sensorPinValue = analogRead(sensorPin3);
sensorPinValue = analogRead(sensorPin4);
sensorPinValue = analogRead(sensorPin5);

The value of which pin is going to be in sensorPinValue?