int value;

void setup()
{
 	pinMode(13, INPUT);
  pinMode(7, OUTPUT);
	pinMode(4, OUTPUT);
  	Serial.begin(9600);
  
}

void loop()
{
 	value = digitalRead(13);
	Serial.println(value);
	delay(100);

	if (value==1) { digitalWrite(7,HIGH); digitalWrite(4, LOW);}
	else if (value==0) { digitalWrite(4, HIGH); digitalWrite(7, LOW);}
  
}