Arduino Uno Code for E- Dustbin

E - Dustibin is the future of world, So every developing country is now finding the ways of collecting the garbage according to their category, like plastic garbage , metallic garbage, or biodegardable and not degradable items saparately.
So to have this thing in mind we have develop a science project of moving and auto open close and E- dustbin. Which will move at predefine path and collect the garbage and also automatically opens when user comes in near to that. 

#include <Servo.h>

Servo myservo;
int arr[9];

int punnu; 

void setup()
{
  Serial.begin(9600);
  myservo.attach(9);
  pinMode(8,INPUT);
   pinMode(10,INPUT);
    pinMode(11,INPUT);
}
int sawan()
{
int sensorValue1 = analogRead(A0);
int sensorValue2 = analogRead(A1);
int sensorValue3 = analogRead(A2);
return sensorValue1+sensorValue2+sensorValue3/6;

  }
void loop()
{
  int sum=0;

  for(int i=0;i<9;i++)
    {
         arr[i]=sawan();
    }
     for(int i=0;i<9;i++)
      {
         sum=sum+arr[i];
         sum=sum/9;
         punnu=sum;
    }
 chauhan: 
  int sensorValue1 = analogRead(A0);
  int sensorValue2 = analogRead(A1);
  int sensorValue3 = analogRead(A2);
    if((sensorValue1>punnu)||(sensorValue2>punnu)||(sensorValue3>punnu))
    {
      for (int pos = 0; pos <= 180; pos += 1)
      {
        myservo.write(180);           
        delay(500);                     
      }
    }
  else
   {
     for (int pos = 180; pos >= 0; pos -= 1)
     {
       myservo.write(pos);           
      delay(5000);                   
     }
   }
goto chauhan;
}