void setup() {
  pinMode(13, OUTPUT);
  pinMode(12, OUTPUT);
  pinMode(8, OUTPUT);
  pinMode(7, OUTPUT);


}

void loop() {
for(int i=0 ;i=1;i++) {
digitalWrite(13, HIGH);
delay(500);
digitalWrite(13,LOW);
digitalWrite(12, HIGH);
delay(500);
digitalWrite(12, LOW);
digitalWrite(8, HIGH);
delay(500);
digitalWrite(8, LOW);
digitalWrite(7, HIGH);
delay(500);
digitalWrite(7, LOW);










}
}