int LED[] = {2,4,16,17,5};
#define SW 14

void setup() {
  Serial.begin(9600);
  for(int i = 0 ; i <= 4 ; i = i + 1){
    pinMode(LED[i], OUTPUT);
    pinMode(SW, INPUT) ;
  }
}

void loop() {
  Serial.println(digitalRead(SW));
  if(digitalRead(SW) == 1){
    for(int i = 4 ; i >= 0 ; i = i - 1){
      digitalWrite(LED[i],1);
      delay(500);
    }
    for(int i = 4 ; i >= 0 ; i = i - 1){
      digitalWrite(LED[i],0);
    }
  }
  if(digitalRead(SW) == 0){
    for(int i = 4 ; i >= 0 ; i = i - 1){
      digitalWrite(LED[i],0);
    }
  }
}