//define variables
int LED1=2;
int LED2=3;
int LED4=4;
int LED8=5;
int delayMS=1000;

void setup() {
  // put your setup code here, to run once:
  pinMode(LED1, OUTPUT);
  pinMode(LED2, OUTPUT);
  pinMode(LED4, OUTPUT);
  pinMode(LED8, OUTPUT);
  
}

void loop() {
  // put your main code here, to run repeatedly:
  //ZERO
  digitalWrite(LED1, LOW);
  digitalWrite(LED2, LOW);
  digitalWrite(LED4, LOW);
  digitalWrite(LED8, LOW);
  delay(delayMS);

  //ONE
  digitalWrite(LED1, HIGH);
  digitalWrite(LED2, LOW);
  digitalWrite(LED4, LOW);
  digitalWrite(LED8, LOW);
  delay(delayMS);

  //TWO
  digitalWrite(LED1, LOW);
  digitalWrite(LED2, HIGH);
  digitalWrite(LED4, LOW);
  digitalWrite(LED8, LOW);
  delay(delayMS);

  //THREE
  digitalWrite(LED1, HIGH);
  digitalWrite(LED2, HIGH);
  digitalWrite(LED4, LOW);
  digitalWrite(LED8, LOW);
  delay(delayMS);

  //FOUR
  digitalWrite(LED1, LOW);
  digitalWrite(LED2, LOW);
  digitalWrite(LED4, HIGH);
  digitalWrite(LED8, LOW);
  delay(delayMS);

  //FIVE
  digitalWrite(LED1, HIGH);
  digitalWrite(LED2, LOW);
  digitalWrite(LED4, HIGH);
  digitalWrite(LED8, LOW);
  delay(delayMS);

  //SIX
  digitalWrite(LED1, LOW);
  digitalWrite(LED2, HIGH);
  digitalWrite(LED4, HIGH);
  digitalWrite(LED8, LOW);
  delay(delayMS);

  //SEVEN
  digitalWrite(LED1, HIGH);
  digitalWrite(LED2, HIGH);
  digitalWrite(LED4, HIGH);
  digitalWrite(LED8, LOW);
  delay(delayMS);

  //EIGHT
  digitalWrite(LED1, LOW);
  digitalWrite(LED2, LOW);
  digitalWrite(LED4, LOW);
  digitalWrite(LED8, HIGH);
  delay(delayMS);

  //NINE
  digitalWrite(LED1, HIGH);
  digitalWrite(LED2, LOW);
  digitalWrite(LED4, LOW);
  digitalWrite(LED8, HIGH);
  delay(delayMS);

  //TEN
  digitalWrite(LED1, LOW);
  digitalWrite(LED2, HIGH);
  digitalWrite(LED4, LOW);
  digitalWrite(LED8, HIGH);
  delay(delayMS);

  //ELEVEN
  digitalWrite(LED1, HIGH);
  digitalWrite(LED2, HIGH);
  digitalWrite(LED4, LOW);
  digitalWrite(LED8, HIGH);
  delay(delayMS);

  //TWELVE
  digitalWrite(LED1, LOW);
  digitalWrite(LED2, LOW);
  digitalWrite(LED4, HIGH);
  digitalWrite(LED8, HIGH);
  delay(delayMS);

  //THIRTEEN
  digitalWrite(LED1, HIGH);
  digitalWrite(LED2, LOW);
  digitalWrite(LED4, HIGH);
  digitalWrite(LED8, HIGH);
  delay(delayMS);

  //FOURTEEN
  digitalWrite(LED1, LOW);
  digitalWrite(LED2, HIGH);
  digitalWrite(LED4, HIGH);
  digitalWrite(LED8, HIGH);
  delay(delayMS);

  //FIFTEEN
  digitalWrite(LED1, HIGH);
  digitalWrite(LED2, HIGH);
  digitalWrite(LED4, HIGH);
  digitalWrite(LED8, HIGH);
  delay(delayMS);

  
}