#define led1 3
#define led2 4
#define led3 5

void setup() {
  // put your setup code here, to run once:
pinMode(led1 ,OUTPUT);
pinMode(led2 ,OUTPUT);
pinMode(led3 ,OUTPUT);
}

void loop() {
  // put your main code here, to run repeatedly:
digitalWrite(led1, HIGH);
digitalWrite(led2, HIGH);
digitalWrite(led3, HIGH);
delay(3000);
digitalWrite(led1, LOW);
digitalWrite(led2, LOW);
digitalWrite(led3, LOW);
delay(1000);





}