Photoresistor LED

//const int Button=7;
const int PhotoPin=A0;
const int LEDPin=5;
int ReadValue=0;
void setup()
{
  pinMode (PhotoPin, INPUT);
  Serial.begin(9600);
  // put your setup code here, to run once:

}

void loop()
{
  ReadValue=analogRead(PhotoPin);
  ReadValue=map (ReadValue,170,15,0,255);
  //these numbers indicate min (15) and max (170) and it inserts it into the readvalue)
  Serial.println(ReadValue);
  analogWrite (LEDPin, ReadValue);
  // put your main code here, to run repeatedly:

}