int r1 = 13;
int r2 = 12;
int butt = 11;
int bs = 0;

void setup() {
  // put your setup code here, to run once:
pinMode(11, INPUT_PULLUP);
pinMode(12, OUTPUT);
pinMode(13, OUTPUT);

Serial.begin(9600);
}

void loop() {
  // put your main code here, to run repeatedly:
bs = digitalRead(butt);

if(bs == LOW)
{
  digitalWrite(r1, HIGH);
}
else  
{
  digitalWrite(r1, LOW);
}

Serial.println(bs);
}