Boom of an Excavator

#include <Servo.h>
Servo Boom1;
Servo Boom2;
Servo Buck;

int x1 = A4;
int y1 = A5;
int s1 = A3;

int y2 = A0;
int s2 = A1;
int x2 = 13;

float posBoom1 = 0;
float posBoom2 = 0;
float posBuck = 0;

void setup() {
  Boom1.attach(10);
  Boom2.attach(6);
  Buck.attach(3);

  Serial.begin(9600);

  pinMode(x1,INPUT);
  pinMode(y1,INPUT);
  pinMode(s1,INPUT);
  pinMode(x2,INPUT);
  pinMode(s2,INPUT);
  pinMode(y2,INPUT);

}

void loop() {
  Buck.write(analogRead(x1)/1023.0 * 180.0);
  Boom2.write(analogRead(y1)/1023.0 * 90.0);
  Boom1.write(analogRead(y2)/1023.0 * 80.0);

}