Using a Photoresistor with 3 LEDs

/*
 *  Jung Min Yean
 *  04/02/19
 *  Learning How to Use a Photoresistor with LEDs
 */

 const int LedPin1 = 9;
 const int LedPin2 = 10;
 const int LedPin3 = 11;
 const int PhotoPin = A0;
 const int PotPin = A1;
 int PotVal = 0;
 int PhotoVal = 0;

void setup()
{
 pinMode(LedPin1, OUTPUT);
 pinMode(LedPin2, OUTPUT);
 pinMode(LedPin3, OUTPUT);
 pinMode(PhotoPin, INPUT);
 Serial.begin(9600);
}

void loop()
{
  // test potentiometer
  // PotVal = analogRead(PotPin);
  PhotoVal = analogRead(PhotoPin);
  Serial.println(PhotoVal);
  delay (200);
  // Serial.print("      ");
  int MapVal = map(PhotoVal,0,173,255,0);
  MapVal = constrain(MapVal, 0,255);
  Serial.println(MapVal);
  analogWrite(LedPin1, MapVal);
  analogWrite(LedPin2, MapVal);
  analogWrite(LedPin3, MapVal);
}