Water Sensor with LED

const int watersensor = A0;
const int led = 5;
int readValue = 0;
int MinVal = 1000;
int MaxVal = 0;


void setup()
{
  pinMode (watersensor, INPUT);
  pinMode (led, OUTPUT);
  Serial.begin (9600);


}

void loop()
{
 readValue = analogRead (watersensor);
 Serial.println (readValue);
 readValue = map(readValue, 0,65, 0, 255);
 analogWrite (led, readValue);
}