const int buttonPin = 27;  // the number of the pushbutton pin
const int ledPin = 0;    // the number of the LED pin
bool flag=false; // boolean operation 
bool pressed=false;
// variables will change:
int buttonState = 0;  // variable for reading the pushbutton status

void setup() {
  // initialize the LED pin as an output:
  pinMode(ledPin, OUTPUT);
  // initialize the pushbutton pin as an input:
  pinMode(buttonPin, INPUT);
}

void loop() {
  // read the state of the pushbutton value:
  buttonState = digitalRead(buttonPin);
if (buttonState==HIGH){
  if (pressed==false){
      flag=!flag; //changes to opposite value
      pressed=true;
  }
  
}else{
  pressed=false;
  delay(50);
}
digitalWrite(ledPin, flag);
  
}