int p1 = 7;
int p2 = 13;
int p3 = 8; 
void setup() {
  // put your setup code here, to run once:
  pinMode(p1, INPUT);
  pinMode(p2, OUTPUT);
  pinMode(p3, OUTPUT);

}

void loop() {
  // put your main code here, to run repeatedly:
  if(digitalRead(p1)==0)
  {
    digitalWrite(p2, LOW);
    digitalWrite(p3, HIGH);
    delay(500);
  }
  else{
    digitalWrite(p2, HIGH);
    digitalWrite(p3, LOW);
  }
}