int LEDpin1=11;
int LEDpin2=12;
int LEDpin3=10;
int LEDpin4=13;
int button=2;
int buttonstate=0;

void setup() {
  // put your setup code here, to run once:
  Serial.begin(115200);
  Serial.println("Hello, STM32!");
  pinMode(LEDpin1,OUTPUT);
  //delay(1000);
  pinMode(LEDpin2,OUTPUT);
  //delay((1000));
  pinMode(LEDpin3, OUTPUT);
  pinMode(LEDpin4,OUTPUT);
  pinMode(button, INPUT_PULLUP);
}

void loop() {

digitalWrite(LEDpin1, HIGH);
//delay(1000);
digitalWrite(LEDpin2, HIGH);
//elay(1000);
digitalWrite(LEDpin3, HIGH);
delay(1000);
digitalWrite(LEDpin1, LOW);
digitalWrite(LEDpin2, LOW);
digitalWrite(LEDpin3, LOW);
  delay(1000); 
  buttonstate = digitalRead(button);// this speeds up the simulation

if (buttonState == LOW) { // Button is pressed (LOW because of pull-up)
    digitalWrite(LEDpin4, HIGH); // Turn LED on
  } else {
    digitalWrite(LEDpin4, LOW)


}