#include <Servo.h>
 
Servo myservo;
int value = 0;
int pos = 0;
void setup() {
 Serial.begin(115200);
  myservo.attach(9);
}

void loop() {
  int value = Serial.parseInt();
  Serial.println("  ");


  for (pos = 0; pos <= value; pos += 1) {
    myservo.write(pos);              
    delay(15);                      
  }
  for (pos = value; pos >= 0; pos -= 1) {
    myservo.write(pos);              
    delay(15);                      
  }
}