//00515
void setup() {
  // put your setup code here, to run once:
pinMode(13, OUTPUT);
pinMode(12, INPUT_PULLUP);
}
int State=0;
int newBts = 0;
int oldBts=0;
int cl=0;
void loop() {
  // put your main code here, to run repeatedly:
newBts=digitalRead(12);
if ((oldBts!=newBts) and (newBts==0)){
  cl++;
  if (cl%2==0){
    if(State==1) {
      digitalWrite(13,0);
      State=0;
    }
    else {
      digitalWrite(13,1);
      State = 1;
      }
    }
  }
  oldBts = newBts;
  delay(50);
}