#define led1 13
#define led2 12
#define led3 11
#define led4 10



void setup() {
  pinMode(led1, OUTPUT);
  pinMode(led2, OUTPUT);
  pinMode(led3, OUTPUT);
  pinMode(led4, OUTPUT);


}

void loop() {
  digitalWrite(led1, HIGH);
  delay(100);
  digitalWrite(led1,LOW);
  delay(100);
  digitalWrite(led2, HIGH);
  delay(100);
  digitalWrite(led2,LOW);
  delay(100);
  digitalWrite(led3, HIGH);
  delay(100);
  digitalWrite(led3,LOW);
  delay(100);
  digitalWrite(led4, HIGH);
  delay(100);
  digitalWrite(led4,LOW);
  delay(100);

}