#include <Servo.h>

Servo myServo;

int lastPos = 90;

void setup() {
  myServo.attach(9);
  myServo.write(90);

  pinMode(3, INPUT);
  pinMode(4, INPUT);

  pinMode(10, INPUT);

  delay(2000);
}

void loop() {

  if (digitalRead(10) == HIGH) {
    for (int i = lastPos; i <= 135; i++) {
      myServo.write(i);
      delay(40);
      lastPos = i;
      if (digitalRead(10) == LOW) {
        break;
      }
    }

    for (int i = lastPos; i >= 45; i--) {
      myServo.write(i);
      delay(40);
      lastPos = i;
      if (digitalRead(10) == LOW) {
        break;
      }
    }
  }


  if (digitalRead(3) == HIGH) {
    for (int i = lastPos; i <= 135; i++) {
      myServo.write(i);
      delay(40);
      lastPos = i;
      if (digitalRead(3) == LOW) {
        break;
      }
    }
  }

  if (digitalRead(4) == HIGH) {
    for (int i = lastPos; i >= 45; i--) {
      myServo.write(i);
      delay(40);
      lastPos = i;
      if (digitalRead(4) == LOW) {
        break;
      }
    }
  }
}