int tekan = 0;

void setup() {
  // put your setup code here, to run once:
pinMode(13, OUTPUT);
pinMode(12, OUTPUT);
pinMode(8, OUTPUT);
pinMode(4, INPUT);
}

void loop() {
  // put your main code here, to run repeatedly:
if(digitalRead(4)==HIGH){
  tekan = tekan + 1;
  delay(200);
}
else if(tekan == 4){
  tekan = 0;
}

if(tekan == 1){
  digitalWrite(13, HIGH);
  Serial.println(tekan);
}
else if(tekan == 2){
  digitalWrite(12, HIGH);
  Serial.println(tekan);
}
else if(tekan == 3){
  digitalWrite(8, HIGH);
  Serial.println(tekan);
}
else if(tekan == 4){
  digitalWrite(13, LOW);
  digitalWrite(12, LOW);
  digitalWrite(8, LOW);
  Serial.println(tekan);
}
}