int r1=7 , r2=6 , r3=5 , r4=4 , r5=3;
void setup() {
  // put your setup code here, to run once:
Serial.begin(9600);
pinMode(r1, OUTPUT);
pinMode(r2, OUTPUT);
pinMode(r3, OUTPUT);
pinMode(r4, OUTPUT);
pinMode(r5, OUTPUT);
}

void loop() {
  // put your main code here, to run repeatedly:
digitalWrite(r1, HIGH);
delay(40);
digitalWrite(r1, LOW);
delay(40);
digitalWrite(r2, HIGH);
delay(40);
digitalWrite(r2, LOW);
delay(40);
digitalWrite(r3, HIGH);
delay(40);
digitalWrite(r3, LOW);
delay(40);
digitalWrite(r4, HIGH);
delay(40);
digitalWrite(r4, LOW);
delay(40);
digitalWrite(r5, HIGH);
delay(40);
digitalWrite(r5, LOW);
delay(40);

digitalWrite(r5, HIGH);
delay(40);
digitalWrite(r5, LOW);
delay(40);
digitalWrite(r4, HIGH);
delay(40);
digitalWrite(r4, LOW);
delay(40);
digitalWrite(r3, HIGH);
delay(40);
digitalWrite(r3, LOW);
delay(40);
digitalWrite(r2, HIGH);
delay(40);
digitalWrite(r2, LOW);
delay(40);
digitalWrite(r1, HIGH);
delay(40);
digitalWrite(r1, LOW);
delay(40);
}