const int led1 = 2;
const int led2 = 3;
const int led3= 4;
const int led4 = 5;

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

void loop() {
int angka = 4;
 if(angka == 1){
  digitalWrite(led1, HIGH);
  delay(200);
  digitalWrite(led1, LOW);
  delay(200);
  }
  else if(angka == 2){
    digitalWrite(led2, HIGH);
    delay(200);
    digitalWrite(led2, LOW);
    delay(200);
 
    }
    else if(angka == 3){
      digitalWrite(led3, HIGH);
      delay(200);
      digitalWrite(led3, LOW);
      delay(200);
      }
      else{
        digitalWrite(led4,HIGH);
        delay(200);
        digitalWrite(led4,LOW);
        delay(200);
            }
}