serial controlled mono servo

// Code for serial servo attachment
#include <Servo.h>
Servo servo1;
long num1;

void setup(){
servo1.attach(3);
Serial.begin(9600);
servo1.write(90);
}

void loop() {
 while(Serial.available()>0)
 {
 num1= Serial.parseInt();
 Serial.print(num1);
 Serial.print(" degree , ");
 Serial.print("Enter Position = ");
 }
 servo1.write(num1);
 delay(15);
}