int button = 5;
int nilaibutton;
int count;

int led1 = 15;
int led2 = 2;
int led3 = 4;
int led4 = 18;

void setup() {
  Serial.begin(9600);
  pinMode(button, INPUT);
  pinMode(led1, OUTPUT);
  pinMode(led2, OUTPUT);
  pinMode(led3, OUTPUT);
  pinMode(led4, OUTPUT);
}

void loop() {
  nilaibutton = digitalRead(button);
  // serial.println(nilaibitton);
 if (nilaibutton == 1) {

 }
    count++;
    Serial.println(count);
    delay(300);
    if (count == 1){
      digitalWrite(led1, HIGH);
      digitalWrite(led2, LOW);
      digitalWrite(led3, LOW);
      digitalWrite(led4, LOW);
    }
    if (count == 2){
      digitalWrite(led1, HIGH);
      digitalWrite(led2, HIGH);
      digitalWrite(led3, LOW);
      digitalWrite(led4, LOW);
    }
    if (count == 3){
      digitalWrite(led1, HIGH);
      digitalWrite(led2, HIGH);
      digitalWrite(led3, HIGH);
      digitalWrite(led4, LOW);
    }
     if (count == 4){
      digitalWrite(led1, HIGH);
      digitalWrite(led2, HIGH);
      digitalWrite(led3, HIGH);
      digitalWrite(led4, HIGH);
      count=0;
         }
        
}