int redled = 2;
int greenled = 4;
int blueled = 7;
int yellowled = 8;
int waittime = 1000;

void setup() {
  // put your setup code here, to run once:
pinMode(redled, OUTPUT);
pinMode(greenled, OUTPUT);
pinMode(blueled, OUTPUT);
pinMode(yellowled, OUTPUT);
}

void loop() {
  // put your main code here, to run repeatedly:

  // 0
digitalWrite(yellowled, LOW);
digitalWrite(blueled, LOW);
digitalWrite(greenled, LOW);
digitalWrite(redled, LOW);
delay(waittime);

  // 1
digitalWrite(yellowled, LOW);
digitalWrite(blueled, LOW);
digitalWrite(greenled, LOW);
digitalWrite(redled, HIGH);
delay(waittime);

  // 2
digitalWrite(yellowled, LOW);
digitalWrite(blueled, LOW);
digitalWrite(greenled, HIGH);
digitalWrite(redled, LOW);
delay(waittime);

  // 3
digitalWrite(yellowled, LOW);
digitalWrite(blueled, LOW);
digitalWrite(greenled, HIGH);
digitalWrite(redled, HIGH);
delay(waittime);

  // 4
digitalWrite(yellowled, LOW);
digitalWrite(blueled, HIGH);
digitalWrite(greenled, LOW);
digitalWrite(redled, LOW);
delay(waittime);

  // 5
digitalWrite(yellowled, LOW);
digitalWrite(blueled, HIGH);
digitalWrite(greenled, LOW);
digitalWrite(redled, HIGH);
delay(waittime);

  // 6
digitalWrite(yellowled, LOW);
digitalWrite(blueled, HIGH);
digitalWrite(greenled, HIGH);
digitalWrite(redled, LOW);
delay(waittime);

  // 7
digitalWrite(yellowled, LOW);
digitalWrite(blueled, HIGH);
digitalWrite(greenled, HIGH);
digitalWrite(redled, HIGH);
delay(waittime);

  // 8
digitalWrite(yellowled, HIGH);
digitalWrite(blueled, LOW);
digitalWrite(greenled, LOW);
digitalWrite(redled, LOW);
delay(waittime);

  // 9
digitalWrite(yellowled, HIGH);
digitalWrite(blueled, LOW);
digitalWrite(greenled, LOW);
digitalWrite(redled, HIGH);
delay(waittime);

  // 10
digitalWrite(yellowled, HIGH);
digitalWrite(blueled, LOW);
digitalWrite(greenled, HIGH);
digitalWrite(redled, LOW);
delay(waittime);

  // 11
digitalWrite(yellowled, HIGH);
digitalWrite(blueled, LOW);
digitalWrite(greenled, HIGH);
digitalWrite(redled, HIGH);
delay(waittime);

  // 12
digitalWrite(yellowled, HIGH);
digitalWrite(blueled, HIGH);
digitalWrite(greenled, LOW);
digitalWrite(redled, LOW);
delay(waittime);

  // 13
digitalWrite(yellowled, HIGH);
digitalWrite(blueled, HIGH);
digitalWrite(greenled, LOW);
digitalWrite(redled, HIGH);
delay(waittime);

  // 14
digitalWrite(yellowled, HIGH);
digitalWrite(blueled, HIGH);
digitalWrite(greenled, HIGH);
digitalWrite(redled, LOW);
delay(waittime);

  // 15
digitalWrite(yellowled, HIGH);
digitalWrite(blueled, HIGH);
digitalWrite(greenled, HIGH);
digitalWrite(redled, HIGH);
delay(waittime);

digitalWrite(yellowled, LOW);
digitalWrite(blueled, LOW);
digitalWrite(greenled, LOW);
digitalWrite(redled, LOW);
delay(5000);
}