#include <Servo.h>
Servo myservo;
int a = 0, b = 1;
long time = 0;
bool c = true;
void setup() {
  Serial.begin(9600);
  myservo.attach(11);
  myservo.write(0);
}
void cool() {
  Serial.println(a);
  myservo.write(a);
  time = millis();
}
void loop() {
  if (c == true && millis() - time >= 20) {
    a += b;
    cool();
  }
  if (a >= 135) {
    c = false;
  }
  if (c == false && millis() - time >= 20) {
    a -= b;
    cool();
  }
  if (a <= 45) {
    c = true;
  }
}