const int pin1 = 13;
const int pin2 = 12;
const int pin3 = 7;
const int pin4 = 2;

void setup() {
  // put your setup code here, to run once:
  pinMode(pin1, OUTPUT);
  pinMode(pin2, OUTPUT);
  pinMode(pin3, OUTPUT);
  pinMode(pin4, OUTPUT);


}

void loop() {
  // put your main code here, to run repeatedly:
  digitalWrite(pin1, HIGH);
  delay(500);
  digitalWrite(pin1, LOW);
  //delay(250);
  digitalWrite(pin2, HIGH);
  delay(250);
  digitalWrite(pin2, LOW);
  //delay(250);
  digitalWrite(pin3, HIGH);
  delay(250);
  digitalWrite(pin3, LOW);
  //delay(250);
  digitalWrite(pin4, HIGH);
  //delay(250);
  digitalWrite(pin4, LOW);
 // delay(250);


  

}