int red=3;
int yellow=5;
int green=7;
void setup() {
  // put your setup code here, to run once:
pinMode(red,OUTPUT);
pinMode(yellow, OUTPUT);
pinMode(green, OUTPUT);
}

void loop() {
  // put your main code here, to run repeatedly:
digitalWrite(red, LOW);
delay(1000);
digitalWrite(red, HIGH);
delay(200);
digitalWrite(yellow, HIGH);
delay(400);
digitalWrite(yellow, LOW);
delay(300);
digitalWrite(green, HIGH);
delay(500);
digitalWrite(green, LOW);
delay(400);
}