#define led 13
#define  led2  12
#define  led3  8
#define  led4  7

void setup() {
  pinMode(led, OUTPUT);
  pinMode(led2, OUTPUT);
  pinMode(led3, OUTPUT);
  pinMode(led4, OUTPUT);

}

void loop() {
  digitalWrite(led, HIGH);
  delay(1000);
  
  digitalWrite(led2, HIGH);
  delay(1000);
  digitalWrite(led3, HIGH);
  delay(1000);
  digitalWrite(led4, HIGH);
  delay(1000);


  digitalWrite(led, LOW);
  delay(1000);
  digitalWrite(led2, LOW);
  delay(1000);
  digitalWrite(led3, LOW);
  delay(1000);
  digitalWrite(led4, LOW);
  delay(1000);
}