The more i think about it the more i need to know more of what you are trying to do and if this is all your code. You can do multiple things at once since they are all checking the same thing..... so you could do this.
if (1>50 && 2>50 && 3>50 && 4>50 && 5>50)
But i would advise assigning names to your pins because using the pin numbers gets to be frustration. In any case to get reading you have to call a function that does so.
const byte sensorOne = 1; // sensor one is connected to pin one
int sensorOneVal; // create variable to hold the incoming value
pinMode(sensorOne, INPUT); // set pin one as an input
sensorOneVal = analogRead(sensorOne); // read the value of sensor one and store it to sensorOneVal
if (sensorOneVal > 50) // see if the sensor value was above 50
display photo1.jpg // display the photo, whatever that means....
My advice, if you just read what i put in that code block and have no idea whats happening..... start here
and read lots more!