     digitalWrite(flashPins[i], HIGH);
     delay(200);
     digitalWrite(flashPins[i], LOW);
-    delay(delayBetweenFlashes * 1000l);
+    delay(delayBetweenFlashes * 1000);
   }
 }
 

void loop()
{
  flashCircle();
  delay(overallDelay * 1000l);
}

void flashCircle()

const int flashPins[] = {7, 6, 5};

const long overallDelay = 20; // seconds
const long delayBetweenFlashes = 1; // seconds

void setup()
{
