#include <Servo.h>
Servo servo;
void setup() {
  // put your setup code here, to run once:
  pinMode(1, OUTPUT);
  pinMode(2, OUTPUT);
  pinMode(3, OUTPUT);
  servo.attach(4);
}

void loop() {
  // put your main code here, to run repeatedly:
  digitalWrite(1, LOW);
  delay(500);  
  digitalWrite(2, LOW);
  delay(500);
  digitalWrite(3, LOW);
  delay(500);
  servo.write(0);
  delay(500);
  servo.write(180);
  delay(1);
  digitalWrite(1, HIGH);
  delay(500);
  digitalWrite(2, HIGH);
  delay(1000);
  digitalWrite(3, HIGH);
  delay(1500);
}