int switchState = 0;
void setup() {
  // put your setup code here, to run once:
pinMode(3,OUTPUT);
pinMode(2,INPUT);
}

void loop() {
  // put your main code here, to run repeatedly:
switchState = digitalRead(2);
if (switchState == LOW)
{
  digitalWrite(3, HIGH);
  delay(500);
  digitalWrite(3, LOW);
  delay(500);
}
else
{
  digitalWrite(3, HIGH);
}
if (switchState == LOW)
{
  digitalWrite(4, HIGH);
  delay(500);
  digitalWrite(4, LOW);
  delay(500);
}
else
{
  digitalWrite(4, HIGH);
}
if (switchState == LOW)
{
  digitalWrite(5, HIGH);
  delay(500);
  digitalWrite(5, LOW);
  delay(500);
}
else
{
  digitalWrite(5, HIGH);
}
}