int led1=11;
int led2=6;
int led3=7;
int led4=5;
void setup() {
  // put your setup code here, to run once:
  pinMode(led1, OUTPUT);
  pinMode(led2, OUTPUT);
  pinMode(led3, OUTPUT);
  pinMode(led4, OUTPUT);
}

void loop() {
  // put your main code here, to run repeatedly:
  digitalWrite(led1, HIGH);
  delay(500);
  digitalWrite(led1, LOW);
  delay(500);

  //led2
  digitalWrite(led2, HIGH);
  delay(500);
  digitalWrite(led2, LOW);
  delay(500);
  digitalWrite(led2, HIGH);
  delay(500);
  digitalWrite(led2, LOW);
  delay(500);

  //led3
  digitalWrite(led3, HIGH);
  delay(500);
  digitalWrite(led3, LOW);
  delay(500);
  digitalWrite(led3, HIGH);
  delay(500);
  digitalWrite(led3, LOW);
  delay(500);
  digitalWrite(led3, HIGH);
  delay(500);
  digitalWrite(led3, LOW);
  delay(500);

  //led4
    digitalWrite(led4, HIGH);
    delay(500);
  digitalWrite(led4, LOW);
  delay(500);
  digitalWrite(led4, HIGH);
  delay(500);
  digitalWrite(led4, LOW);
  delay(500);
  digitalWrite(led4, HIGH);
  delay(500);
  digitalWrite(led4, LOW);
  delay(500);
  digitalWrite(led4, HIGH);
  delay(500);
  digitalWrite(led4, LOW);
  delay(500);
}