int gren=3;
int counter;
void setup() {
  // put your setup code here, to run once:
pinMode(gren, OUTPUT);
Serial.begin(9600);
for(counter=0; counter<=4; counter++)
 {
  digitalWrite(gren,HIGH);
  Serial.println("wow on");
  Serial.println(counter);
  delay(1000);
  digitalWrite(gren,LOW);
  Serial.println("wow off");
  delay(1000);
 }
}

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

}