const void (*fp[])(void)
{
  []() {},
  []() {digitalWrite(2, 1); digitalWrite(3, 0);},
  []() {digitalWrite(2, 0); digitalWrite(3, 1);},
  []() {},
};

void setup()
{
  Serial.begin(115200);
  pinMode(2, OUTPUT);
  pinMode(3, OUTPUT);
  digitalWrite(3,1);
}

void loop()
{
  fp[digitalRead(4)+digitalRead(5)*2]();
}