#include <Servo.h>

Servo servo;
int button1 = 2;
int button2= 3;
int button3 = 4;

void setup() {
  pinMode(button1, INPUT);
  pinMode(button2, INPUT);
  pinMode(button3, INPUT);
  servo.attach(9);
  servo.write(90);
}

void loop() {
  int buttonState1 = digitalRead(button1);
  int buttonState2 = digitalRead(button2);
  int buttonState3 = digitalRead(button3);

  if (buttonState1 == LOW) {
    servo.write(0);
    delay(1000);
  } else if(buttonState2 == LOW) {
    servo.write(90);
    delay(1000);
  } else if (buttonState3 == LOW) {
    servo.write(180);
    delay(1000);
  }
}