const int LedPin1=13;              //Declaring pins 13,14,15
const int LedPin2=14;
const int LedPin3=15;
void setup() {
  pinMode (LedPin1,OUTPUT);        //setting up pins
  pinMode (LedPin2,OUTPUT);
  pinMode (LedPin3,OUTPUT);
}
 
void loop() {
  digitalWrite(LedPin1,HIGH);      //Turn on LED
  delay(2000);                      //Wait for 2 seconds
  digitalWrite(LedPin1,LOW);      //Turn off LED
  delay(2000);
  digitalWrite(LedPin2,HIGH);
  delay(2000);
  digitalWrite(LedPin2,LOW);
  delay(2000);
  digitalWrite(LedPin3,HIGH);
  delay(2000);
  digitalWrite(LedPin3,LOW);
  delay(2000);  
}