int tombol = 7;
int led1 = 11;
int led2 = 12;
int led3 = 13;
int i = 0;

void setup() {
  // put your setup code here, to run once:
  pinMode (tombol, INPUT);
  pinMode (led1, OUTPUT);
  pinMode (led2, OUTPUT);
  pinMode (led3, OUTPUT);
  
}

void loop() {
  // put your main code here, to run repeatedly:
  int buttonState = digitalRead (tombol);
  
  if (buttonState == HIGH)
  {
    i++;
  }
  
  if (i == 1)
  {
    digitalWrite (led1, HIGH);
    digitalWrite (led2, LOW);
    digitalWrite (led3, LOW);
    delay (250);
    digitalWrite (led1, LOW);
    digitalWrite (led2, HIGH);
    digitalWrite (led3, LOW);
    delay (250);
    digitalWrite (led1, LOW);
    digitalWrite (led2, LOW);
    digitalWrite (led3, HIGH);
    delay (250);
  }
  else
  {
    digitalWrite (led1, LOW);
    digitalWrite (led2, LOW);
    digitalWrite (led3, LOW);
    delay (250);
  }
  if (i >= 2)
  {
    i = 0;
  }
 }