const byte LEDpin[] = {5,6,7,8,9}; 

void setup () {
for (int i = 0 ; i < 5 ; i++) {
pinMode (LEDpin[i], OUTPUT);
}
}

void loop () {
for (int i = 0 ; i < 5; i++) {
	digitalWrite (LEDpin[i], HIGH);
	delay (1000);
}

for (int i = 4 ; i >= 0; i--) {
	digitalWrite (LEDpin[i], LOW);
	delay (1000);
}
}