void setup()
{
  Serial.begin(9600);
  pinMode(13, OUTPUT);
}
void loop()
{
    int x = Serial.parseInt();
    if(x == 1)
    {
      digitalWrite(13, HIGH);
      Serial.println("LED is on");
      delay(1000);
    }
    else if (x == 0) 
    {
      digitalWrite(12, LOW);
      Serial.println("LED is off"); 
      delay(1000);
    }
}