#define EXO 1
#define EXI 2
#define EXE 3
void setup() {
  // put your setup code here, to run once:
pinMode(EXO,OUTPUT);
pinMode(EXI,OUTPUT);
pinMode(EXE,OUTPUT);
}

void loop() {
  // put your main code here, to run repeatedly:
digitalWrite(EXO,HIGH);
delay(700);
digitalWrite(EXO,LOW);
delay(700);
digitalWrite(EXI,HIGH);
delay(600);
digitalWrite(EXI,LOW);
delay(600);
digitalWrite(EXE,HIGH);
delay(500);
digitalWrite(EXE,LOW);
delay(500);
}