const int pinRed = 7;
const int pinYellow = 6;
const int pinGreen = 5;
void setup() {
  pinMode(pinRed, OUTPUT);
  pinMode(pinYellow, OUTPUT);
  pinMode(pinGreen, OUTPUT);
  // put your setup code here, to run once:

}

void loop() {
  digitalWrite(pinRed, HIGH);
  digitalWrite(pinYellow, LOW);
  delay(10000);
  digitalWrite(pinRed, LOW);
  digitalWrite(pinYellow, HIGH);
  delay(5000);
  digitalWrite(pinYellow, LOW);
  digitalWrite(pinGreen, HIGH);
  delay(12000);
  digitalWrite(pinGreen, LOW);
  digitalWrite(pinYellow, HIGH);
  delay(5000);
  }