int relay1=2;
int relay2=3;
int relay3=4;
int relay4=5;

void setup() {
  // put your setup code here, to run once:
pinMode(relay1, OUTPUT);
pinMode(relay2, OUTPUT);
pinMode(relay3, OUTPUT);
pinMode(relay4, OUTPUT);
}

void loop() {
  // put your main code here, to run repeatedly:
digitalWrite(relay1, HIGH);
delay(4000);
digitalWrite(relay1, LOW);
delay(4000);
digitalWrite(relay2, HIGH);
delay(3000);
digitalWrite(relay2, LOW);
delay(3000);
digitalWrite(relay3, HIGH);
delay(2000);
digitalWrite(relay3, LOW);
delay(2000);
digitalWrite(relay4, HIGH);
delay(1000);
digitalWrite(relay4, LOW);
}