Arduino Robot Arm

#include <Servo.h>
Servo servo;
Servo servo2;
Servo servo3;
int Xval, Yval , posx,posy;
void setup (){
  Serial.begin(9600);
  servo.attach (5);
  servo2.attach (6);
  servo3.attach (7);
}
void loop (){
  Xval = analogRead(A0);
  Yval = analogRead(A1);        
  Serial.print(Xval);  
  Serial.print('\t');
  Serial.print(Yval);
  Serial.print('\t');
  posx=map(Xval,0,1023,0,180);
  Serial.print(posx);
  posy=map(Yval,0,1023,0,180);
  Serial.print(posy);
  servo.write(posx);
  servo3.write(posx);
  delay(15);
  servo2.write(posy);
  delay (15);
  servo2.write(posy);
  delay(15);
}