int led1=2;
int led2=12;
int led3=11;
int led4=10;
int led5=9;
int masa=100;

void setup () {
  pinMode (led1,OUTPUT);
  pinMode (led2,OUTPUT);
  pinMode (led3,OUTPUT);
  pinMode (led4,OUTPUT);
  pinMode (led5,OUTPUT);
}

void loop () {
  digitalWrite(led1,HIGH);
  delay (masa);
  digitalWrite(led1,LOW);
  delay (masa);

  digitalWrite(led2,HIGH);
  delay (masa);
  digitalWrite(led2,LOW);
  delay (masa);

  digitalWrite(led3,HIGH);
  delay (masa);
  digitalWrite(led3,LOW);
  delay (masa);

  digitalWrite(led4,HIGH);
  delay (masa);
  digitalWrite(led4,LOW);
  delay (masa);

  digitalWrite(led5,HIGH);
  delay (masa);
  digitalWrite(led5,LOW);
  delay (masa);

  digitalWrite(led4,HIGH);
  delay (masa);
  digitalWrite(led4,LOW);
  delay (masa);

  digitalWrite(led3,HIGH);
  delay (masa);
  digitalWrite(led3,LOW);
  delay (masa);

  digitalWrite(led2,HIGH);
  delay (masa);
  digitalWrite(led2,LOW);
  delay (masa);
}