import java.util.*;

public class Main{
  public static void main(String[] args){
    Scanner sc = new Scanner(System.in);
    int N = Integer.parseInt(sc.nextLine());
    String[] S = sc.nextLine().split(" ");
    int[] nums = new int[N];
    int sum = 0;
    for(int i = 0; i < N; i++){
      nums[i] = Integer.parseInt(S[i]);
      sum += nums[i];
    }
    
    int ans = 0;
    double d = (double)sum/N;
    int ave = (int)Math.round(d);
    for(int i = 0; i < N; i++){
      ans += (int)Math.pow(nums[i]-ave, 2);
    }
    System.out.println(ans);
  }
} import java.util.*; util.* java public class Main{
  public static void main(String[] args){
    Scanner sc = new Scanner(System.in);
    int N = Integer.parseInt(sc.nextLine());
    String[] S = sc.nextLine().split(" ");
    int[] nums = new int[N];
    int sum = 0;
    for(int i = 0; i < N; i++){
      nums[i] = Integer.parseInt(S[i]);
      sum += nums[i];
    }
    
    int ans = 0;
    double d = (double)sum/N;
    int ave = (int)Math.round(d);
    for(int i = 0; i < N; i++){
      ans += (int)Math.pow(nums[i]-ave, 2);
    }
    System.out.println(ans);
  }
} Main public static void main(String[] args){
    Scanner sc = new Scanner(System.in);
    int N = Integer.parseInt(sc.nextLine());
    String[] S = sc.nextLine().split(" ");
    int[] nums = new int[N];
    int sum = 0;
    for(int i = 0; i < N; i++){
      nums[i] = Integer.parseInt(S[i]);
      sum += nums[i];
    }
    
    int ans = 0;
    double d = (double)sum/N;
    int ave = (int)Math.round(d);
    for(int i = 0; i < N; i++){
      ans += (int)Math.pow(nums[i]-ave, 2);
    }
    System.out.println(ans);
  } main {
    Scanner sc = new Scanner(System.in);
    int N = Integer.parseInt(sc.nextLine());
    String[] S = sc.nextLine().split(" ");
    int[] nums = new int[N];
    int sum = 0;
    for(int i = 0; i < N; i++){
      nums[i] = Integer.parseInt(S[i]);
      sum += nums[i];
    }
    
    int ans = 0;
    double d = (double)sum/N;
    int ave = (int)Math.round(d);
    for(int i = 0; i < N; i++){
      ans += (int)Math.pow(nums[i]-ave, 2);
    }
    System.out.println(ans);
  } Scanner sc = new Scanner(System.in); sc new Scanner(System.in) int N = Integer.parseInt(sc.nextLine()); N Integer.parseInt(sc.nextLine()) Integer.parseInt Integer sc.nextLine() sc.nextLine sc String[] S = sc.nextLine().split(" "); S sc.nextLine().split(" ") sc.nextLine().split sc.nextLine() sc.nextLine sc " " int[] nums = new int[N]; nums new int[N] N int sum = 0; sum 0 for(int i = 0; i < N; i++){
      nums[i] = Integer.parseInt(S[i]);
      sum += nums[i];
    } int i = 0; int i = 0; i 0 i < N i N i++ i++ i {
      nums[i] = Integer.parseInt(S[i]);
      sum += nums[i];
    } {
      nums[i] = Integer.parseInt(S[i]);
      sum += nums[i];
    } nums[i] = Integer.parseInt(S[i]) nums[i] nums i Integer.parseInt(S[i]) Integer.parseInt Integer S[i] S i sum += nums[i] sum nums[i] nums i int ans = 0; ans 0 double d = (double)sum/N; d (double)sum/N (double)sum N int ave = (int)Math.round(d); ave (int)Math.round(d) Math.round Math d for(int i = 0; i < N; i++){
      ans += (int)Math.pow(nums[i]-ave, 2);
    } int i = 0; int i = 0; i 0 i < N i N i++ i++ i {
      ans += (int)Math.pow(nums[i]-ave, 2);
    } {
      ans += (int)Math.pow(nums[i]-ave, 2);
    } ans += (int)Math.pow(nums[i]-ave, 2) ans (int)Math.pow(nums[i]-ave, 2) Math.pow Math nums[i]-ave nums[i] nums i ave 2 System.out.println(ans) System.out.println System.out System System.out ans String[] args args public class Main{
  public static void main(String[] args){
    Scanner sc = new Scanner(System.in);
    int N = Integer.parseInt(sc.nextLine());
    String[] S = sc.nextLine().split(" ");
    int[] nums = new int[N];
    int sum = 0;
    for(int i = 0; i < N; i++){
      nums[i] = Integer.parseInt(S[i]);
      sum += nums[i];
    }
    
    int ans = 0;
    double d = (double)sum/N;
    int ave = (int)Math.round(d);
    for(int i = 0; i < N; i++){
      ans += (int)Math.pow(nums[i]-ave, 2);
    }
    System.out.println(ans);
  }
} public class Main{
  public static void main(String[] args){
    Scanner sc = new Scanner(System.in);
    int N = Integer.parseInt(sc.nextLine());
    String[] S = sc.nextLine().split(" ");
    int[] nums = new int[N];
    int sum = 0;
    for(int i = 0; i < N; i++){
      nums[i] = Integer.parseInt(S[i]);
      sum += nums[i];
    }
    
    int ans = 0;
    double d = (double)sum/N;
    int ave = (int)Math.round(d);
    for(int i = 0; i < N; i++){
      ans += (int)Math.pow(nums[i]-ave, 2);
    }
    System.out.println(ans);
  }
} Main
import java.util.*;

public class Main{
  public static void main(String[] args){
    Scanner sc = new Scanner(System.in);
    int N = Integer.parseInt(sc.nextLine());
    String[] S = sc.nextLine().split(" ");
    int[] nums = new int[N];
    int sum = 0;
    for(int i = 0; i < N; i++){
      nums[i] = Integer.parseInt(S[i]);
      sum += nums[i];
    }
    
    int ans = 0;
    double d = (double)sum/N;
    int ave = (int)Math.round(d);
    for(int i = 0; i < N; i++){
      ans += (int)Math.pow(nums[i]-ave, 2);
    }
    System.out.println(ans);
  }
}
