int LED = 7;
int btn = 5;

void setup() {
  // put your setup code here, to run once:
pinMode(LED, OUTPUT);
pinMode(btn, INPUT_PULLUP);
digitalWrite(LED, LOW);

}

void loop() {
  // put your main code here, to run repeatedly:
if(digitalRead(btn) == LOW){
  digitalWrite(LED, HIGH);
  delay(3000);
  digitalWrite(LED, LOW);
  delay(500);
  digitalWrite(LED, HIGH);
  delay(6000);
  digitalWrite(LED, LOW);

}
}