void setup() {
Serial.begin(9600);
pinMode(13, OUTPUT);
pinMode(12, OUTPUT);
pinMode(11, OUTPUT);
}

void loop() {
 int value = analogRead(A0);
 Serial.println(analogRead(A0));

if(value < 300){
digitalWrite(13, true);
digitalWrite(12, false);
digitalWrite(11, false);
}
if(value >= 300 and value < 700){
digitalWrite(13, false);
digitalWrite(12, false);
digitalWrite(11, true);
}
if(value >= 700){
digitalWrite(13, false);
digitalWrite(12, true);
digitalWrite(11, false);

}
}