void setup() {
  // put your setup code here, to run once:
for(int LED = 1; LED<=6 ; LED++){
   pinMode(LED, OUTPUT );
}
}

void loop() {
  // put your main code here, to run repeatedly:
for (int LED = 1; LED<= 6; LED++){
  digitalWrite(LED, HIGH);
  delay(500);
  digitalWrite(LED, LOW);
}
}