int LED1=7;
int LED2=6;
int LED3=5;
int LED4=4;
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(100);
  digitalWrite(LED1, LOW);
  delay(100);
  digitalWrite(LED2, HIGH);
  delay(100);
  digitalWrite(LED2, LOW);
  delay(100);
  digitalWrite(LED3, HIGH);
  delay(100);
  digitalWrite(LED3, LOW);
  delay(100);
  digitalWrite(LED4, HIGH);
  delay(100);
  digitalWrite(LED4, LOW);
  delay(100);
  digitalWrite(LED5, HIGH);
  delay(100);
  digitalWrite(LED5, LOW);
  delay(100);
  digitalWrite(LED5, HIGH);
  delay(100);
  digitalWrite(LED5, LOW);
  delay(100);
  digitalWrite(LED4, HIGH);
  delay(100);
  digitalWrite(LED4, LOW);
  delay(100);
  digitalWrite(LED3, HIGH);
  delay(100);
  digitalWrite(LED3, LOW);
  delay(100);
  digitalWrite(LED2, HIGH);
  delay(100);
  digitalWrite(LED2, LOW);
  delay(100);
  digitalWrite(LED1, HIGH);
  delay(100);
  digitalWrite(LED1, LOW);
  delay(100);
}