#define LED 13

void setup() {
  // put your setup code here, to run once:
pinMode(5,INPUT_PULLUP);

pinMode(LED, OUTPUT);
}

void loop() {
  // put your main code here, to run repeatedly:


if (digitalRead(5) == LOW ) {
  digitalWrite(LED, HIGH);
  
  if(digitalRead(5) == HIGH) {
    digitalWrite(LED, HIGH);

    if (digitalRead(5) == LOW) {
      digitalWrite(LED, LOW);

      if(digitalRead(5) == HIGH) {
        digitalWrite(LED, LOW);
      }
    }
  }
}
if (digitalRead(5) == HIGH) { 

if (digitalRead(LED) == HIGH) {
  digitalWrite(LED, LOW);
}
else {
  digitalWrite(LED, HIGH);
}
}
}