const int led1 = 7;
const int led2 = 6;
const int led3 = 5;
const int led4 = 4;
const int led5 = 3;

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

void loop(){
  digitalWrite(led1, HIGH); 
  delay(200);
   

  digitalWrite(led2, HIGH); 
  delay(200);
   

  digitalWrite(led3, HIGH);
  delay(200);
  

  digitalWrite(led4, HIGH);
  delay(200);
  

  digitalWrite(led5, HIGH);
  delay(500);
  

digitalWrite(led1, LOW);
digitalWrite(led2, LOW);
digitalWrite(led3, LOW);
digitalWrite(led4, LOW);
digitalWrite(led5,LOW);
delay(200);
}