const int buttonPin = 3;
const int ledPin = 7;
int buttonState = 0;

void setup() {
pinMode(ledPin, OUTPUT);
pinMode(buttonPin, INPUT);
}

void loop() {
  buttonState = digitalRead(buttonPin);
  
  if (buttonState == HIGH) {
      digitalWrite(ledPin, HIGH);
      delay(25);
      digitalWrite(ledPin, LOW);    
      delay(25);
  } else {  
      digitalWrite(ledPin, HIGH);
      delay(12.5);
      digitalWrite(ledPin, LOW);    
      delay(12.5);
  }

  }