int status = 0 ;
    void setup() {
     
    pinMode(13, OUTPUT);
    pinMode(7, INPUT);
    }
    void loop() {
      
    if( digitalRead (7)==HIGH ) {
      status ++ ;
      delay(50);
    }
    if(status == 1){
      digitalWrite(13, HIGH);
    }
    else
    {
    digitalWrite(13, LOW);
    status = 0;
    }
  }