int led1 = 13;
int led2 = 12;
int led3 = 7;
int led4 = 6;
int led5 = 5;

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

void loop() {
 digitalWrite(led1,1);
delay(500);
 digitalWrite(led2,1);
delay(500);
 digitalWrite(led3,1);
delay(500);
 digitalWrite(led4,1);
delay(500);
 digitalWrite(led5,1);
delay(500);

 digitalWrite(led5,0);
delay(500);
 digitalWrite(led4,0);
delay(500);
 digitalWrite(led3,0);
delay(500);
 digitalWrite(led2,0);
delay(500);
 digitalWrite(led1,0);
delay(500);
}