int led1=2;
int buttonPin = 3;
int buttonState=0;

void setup()
{
pinMode(led1, OUTPUT);
pinMode(buttonPin, INPUT);
digitalWrite(led1,HIGH);
digitalWrite(buttonPin, HIGH);
}
void  loop()
{
buttonState = digitalRead(buttonPin);
if (buttonState==HIGH){
digitalWrite(led1, LOW);
}
else{
    digitalWrite(led1, HIGH);

}
}