int led =7;
void setup()
{
  pinMode(led, OUTPUT);

}
void loop()
{
  for(int i=0; i<3; i++){
    digitalWrite(led, HIGH);
    delay(250);
    digitalWrite(led ,LOW);
    delay(250);
  }
  delay(1000);
  for(int i=0; i<3; i++)
  {
    digitalWrite(led,HIGH);
    delay(750);
    digitalWrite(led ,LOW);
    delay(1000);
  }
  for(int i=0; i<3; i++)
  {
    digitalWrite(led ,HIGH);
    delay(250);
    digitalWrite(led ,LOW);
    delay(250);
  }
  delay(25000);
}