int i = 0;
const int LedM = 13;
const int LedK = 11;
const int LedH = 9;
const int PBM = 7;
const int PBK = 5;
int hasilbacaPBM;
int hasilbacaPBK;

void setup() {
  Serial.begin(9600);
  pinMode(LedM, OUTPUT);
  pinMode(LedK, OUTPUT);
  pinMode(LedH, OUTPUT);
  pinMode(PBM, INPUT);
  pinMode(PBK, INPUT);
}

void loop() {
  hasilbacaPBM = digitalRead(PBM);
  if(hasilbacaPBM == 1){
    i=i+1;
    delay(500);
  }
    hasilbacaPBK= digitalRead(PBK);
  if(hasilbacaPBK == 1){
    i=i-1;
    delay(500);
  }
  switch(i){
    case 1:
    digitalWrite(LedM, HIGH);
    digitalWrite(LedK, LOW);
    digitalWrite(LedH, LOW);
    break;
    case 2:
    digitalWrite(LedK, HIGH);
    digitalWrite(LedM, LOW);
    digitalWrite(LedH, LOW);
    break;
    case 3:
    digitalWrite(LedK, LOW);
    digitalWrite(LedM, LOW);
    digitalWrite(LedH, HIGH);
    break;
    default:
    break;
  }
  Serial.println(i);
}