unsigned long LED_1;
unsigned long LED_2;
unsigned long LED_3;


void setup() {
  // put your setup code here, to run once:
 pinMode(12 = OUTPUT);
 pinMode(11 = OUTPUT);
 pinMode(10, OUTPUT);
 
 
 LED_1 = millis(300);
 LED_2 = millis(500);
 LED_3 = millis(700);
}

void loop() {
  // put your main code here, to run repeatedly:
 digitalWrite(LED_1 = HIGH);
 millis(300);
 digitalWrite(LED_1 = LOW);
 millis(300);
  digitalWrite(LED_2 = HIGH);
 millis(500);
 digitalWrite(LED_2 = LOW);
 millis(500);
  digitalWrite(LED_3 = HIGH);
 millis(700);
 digitalWrite(LED_3 = LOW);
 millis(700);
}