int red_pin = 5;
int green_pin = 4;
int button_pin = 6;
int button_state;
void setup() {
  Serial.begin(9600);

  pinMode(red_pin, OUTPUT);
  pinMode(green_pin, OUTPUT);
  pinMode(button_pin, INPUT);
}

void loop() {
button_state = digitalRead(button_pin);
Serial.println(button_state);

digitalWrite(red_pin,  !button_state);
digitalWrite(green_pin, button_state);



}