int  LED = 1;
int  LED2 = 2;
int  LED3 = 3;
int  cum = 4;
int buttonstate = 0;

void setup()  {
pinMode(cum, INPUT);
pinMode(LED, OUTPUT);
pinMode(LED2, OUTPUT);
pinMode(LED3, OUTPUT);

}
void loop() {
  buttonstate = digitalRead(cum);
  if (buttonstate == HIGH) {

  digitalWrite(LED, HIGH);
  delay(2000);

  digitalWrite(LED2, HIGH);
  delay(2000);
 
  digitalWrite(LED3, HIGH);
  delay(2000);

 digitalWrite(LED, LOW);
 digitalWrite(LED2, LOW);
 digitalWrite(LED3, LOW);

 
  
    }

  
 
}