void setup() {
  // put your setup code here, to run once:
  Serial.begin(9600);
}

void loop() {
  // put your main code here, to run repeatedly:
int angle = analogRead(A0);
delay(10);
if(angle < 490){
  Serial.println("1");
}
if(530 > angle){
  if(angle > 490){
  Serial.println("2");}
}
if(570 > angle){
  if(angle > 530){
  Serial.println("3");}
}
if(angle > 570){
  Serial.println("4");
}
}