int LED = 2;
int LED2 = 15;
int LED3 = 4;
int LED4 = 5;

void setup() 
{

  pinMode(LED, OUTPUT );
  pinMode(LED2, OUTPUT );
  pinMode(LED3, OUTPUT );
  pinMode(LED4, OUTPUT ); 

}

void loop() 
{
 
  digitalWrite(LED, HIGH);
  delay(50);
  digitalWrite(LED, LOW);
  delay(50);

  digitalWrite(LED2, HIGH);
  delay(100);
  digitalWrite(LED2, LOW);
  delay(100);

  digitalWrite(LED3, HIGH);
  delay(200);
  digitalWrite(LED3, LOW);
  delay(200);

  digitalWrite(LED4, HIGH);
  delay(300);
  digitalWrite(LED4, LOW);
  delay(300);



}