const int pinLED1 = 1;
const int pinLED2 = 2;
const int pinLED3 = 3;
const int pinLED4 = 4;

void setup ()
{
pinMode (pinLED1, OUTPUT);
pinMode (pinLED2, OUTPUT);
pinMode (pinLED3, OUTPUT);
pinMode (pinLED4, OUTPUT);
}
void loop ()
{
digitalWrite (pinLED1, HIGH);
digitalWrite (pinLED2, HIGH);
digitalWrite (pinLED3, HIGH);
digitalWrite (pinLED4, HIGH);
delay(1000);
digitalWrite (pinLED1, LOW);
digitalWrite (pinLED2, LOW);
digitalWrite (pinLED3, LOW);
digitalWrite (pinLED4, LOW);
delay(1000);
digitalWrite (pinLED1, HIGH);
delay(1000);
digitalWrite (pinLED2, HIGH);
delay(1000);
digitalWrite (pinLED3, HIGH);
delay(1000);
digitalWrite (pinLED4, HIGH);
delay(1000);
digitalWrite (pinLED1, LOW);
digitalWrite (pinLED2, LOW);
digitalWrite (pinLED3, LOW);
digitalWrite (pinLED4, LOW);
delay(1000);
digitalWrite (pinLED4, HIGH);
delay(1000);
digitalWrite (pinLED3, HIGH);
delay(1000);
digitalWrite (pinLED2, HIGH);
delay(1000);
digitalWrite (pinLED1 ,HIGH);
delay(1000);
digitalWrite (pinLED1, LOW);
digitalWrite (pinLED2, LOW);
digitalWrite (pinLED3, LOW);
digitalWrite (pinLED4, LOW);
delay(1000);
}