void setup() {
pinMode(2, OUTPUT);
pinMode(3, OUTPUT);
pinMode(4, OUTPUT);
pinMode(5, OUTPUT);
pinMode(6, INPUT) ; 
}

void loop() {
digitalWrite(2, HIGH);
digitalWrite(5, HIGH);
while (digitalRead(6)==HIGH){
delay(1500);
for (int i = 0; i < 3; i++)
{
digitalWrite(5, HIGH);
digitalWrite(2, HIGH);
delay(250);
digitalWrite(5, LOW);
digitalWrite(2, LOW);
delay(250);
}
digitalWrite(5, LOW);

delay(500);

digitalWrite(4, HIGH);
digitalWrite(2, LOW);
digitalWrite(3, HIGH);
delay(500);

digitalWrite(3, LOW);
digitalWrite(2, HIGH);
delay(500);
digitalWrite(4, LOW);
}
}