#define led1 1
#define led2 2
#define led3 3
#define led4 4
#define led5 5
void setup(){
  pinMode(led1, OUTPUT);
  pinMode(led2, OUTPUT);
  pinMode(led3, OUTPUT);
  pinMode(led4, OUTPUT);
  pinMode(led5, OUTPUT);
}

void loop(){
  digitalWrite(led1, HIGH);
  delay(1000);
  digitalWrite(led2, HIGH);
  digitalWrite(led1, LOW);
  delay(1000);
  digitalWrite(led3, HIGH);
  digitalWrite(led2, LOW);
  delay(1000);
  digitalWrite(led4, HIGH);
  digitalWrite(led3, LOW);
  delay(1000);
  digitalWrite(led5, HIGH);
  digitalWrite(led4, LOW);
  delay(1000);
  digitalWrite(led4, HIGH);
  digitalWrite(led5, LOW);
  delay(1000);
  digitalWrite(led3, HIGH);
  digitalWrite(led4, LOW);
  delay(1000);
  digitalWrite(led2, HIGH);
  digitalWrite(led3, LOW);
  delay(1000);
  digitalWrite(led1, HIGH);
  digitalWrite(led2, LOW);
}