import java.io.*;
import java.util.*;
import java.lang.*;

public class Main {
    public static MyScanner scan;
    public static PrintWriter out;
    public static void main(String[] args) {
        scan=new MyScanner();
        out=new PrintWriter(new BufferedOutputStream(System.out));

        int t=1;
//        int t=scan.nextInt();
        while(t-->0) {

            n=scan.nextInt();
            a=new int[n];
            for(int c=0;c<n;c++) a[c]=scan.nextInt();
            long best=Long.MAX_VALUE;
            for(int c=-200;c<200;c++) best=Math.min(best,calc(c));
            out.println(best);
        }
        out.close();
    }

    static int n;
    static int[] a;
    static long calc(int spot) {
        long ans=0;
        for(int c=0;c<n;c++) ans+=(spot-a[c])*(spot-a[c]);
        return ans;
    }

    //scanner
    public static class MyScanner {
        BufferedReader br;
        StringTokenizer st;

        public MyScanner() {
            br = new BufferedReader(new InputStreamReader(System.in));
        }

        String next() {
            while (st == null || !st.hasMoreElements()) {
                try {
                    st = new StringTokenizer(br.readLine());
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
            return st.nextToken();
        }

        int nextInt() {
            return Integer.parseInt(next());
        }

        long nextLong() {
            return Long.parseLong(next());
        }

        double nextDouble() {
            return Double.parseDouble(next());
        }

        String nextLine() {
            String str = "";
            try {
                str = br.readLine();
            } catch (IOException e) {
                e.printStackTrace();
            }
            return str;
        }
    }
} import java.io.*; io.* java import java.util.*; util.* java import java.lang.*; lang.* java public class Main {
    public static MyScanner scan;
    public static PrintWriter out;
    public static void main(String[] args) {
        scan=new MyScanner();
        out=new PrintWriter(new BufferedOutputStream(System.out));

        int t=1;
//        int t=scan.nextInt();
        while(t-->0) {

            n=scan.nextInt();
            a=new int[n];
            for(int c=0;c<n;c++) a[c]=scan.nextInt();
            long best=Long.MAX_VALUE;
            for(int c=-200;c<200;c++) best=Math.min(best,calc(c));
            out.println(best);
        }
        out.close();
    }

    static int n;
    static int[] a;
    static long calc(int spot) {
        long ans=0;
        for(int c=0;c<n;c++) ans+=(spot-a[c])*(spot-a[c]);
        return ans;
    }

    //scanner
    public static class MyScanner {
        BufferedReader br;
        StringTokenizer st;

        public MyScanner() {
            br = new BufferedReader(new InputStreamReader(System.in));
        }

        String next() {
            while (st == null || !st.hasMoreElements()) {
                try {
                    st = new StringTokenizer(br.readLine());
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
            return st.nextToken();
        }

        int nextInt() {
            return Integer.parseInt(next());
        }

        long nextLong() {
            return Long.parseLong(next());
        }

        double nextDouble() {
            return Double.parseDouble(next());
        }

        String nextLine() {
            String str = "";
            try {
                str = br.readLine();
            } catch (IOException e) {
                e.printStackTrace();
            }
            return str;
        }
    }
} Main public static MyScanner scan; scan public static PrintWriter out; out static int n; n static int[] a; a public static void main(String[] args) {
        scan=new MyScanner();
        out=new PrintWriter(new BufferedOutputStream(System.out));

        int t=1;
//        int t=scan.nextInt();
        while(t-->0) {

            n=scan.nextInt();
            a=new int[n];
            for(int c=0;c<n;c++) a[c]=scan.nextInt();
            long best=Long.MAX_VALUE;
            for(int c=-200;c<200;c++) best=Math.min(best,calc(c));
            out.println(best);
        }
        out.close();
    } main {
        scan=new MyScanner();
        out=new PrintWriter(new BufferedOutputStream(System.out));

        int t=1;
//        int t=scan.nextInt();
        while(t-->0) {

            n=scan.nextInt();
            a=new int[n];
            for(int c=0;c<n;c++) a[c]=scan.nextInt();
            long best=Long.MAX_VALUE;
            for(int c=-200;c<200;c++) best=Math.min(best,calc(c));
            out.println(best);
        }
        out.close();
    } scan=new MyScanner() scan new MyScanner() out=new PrintWriter(new BufferedOutputStream(System.out)) out new PrintWriter(new BufferedOutputStream(System.out)) int t=1; t 1 while(t-->0) {

            n=scan.nextInt();
            a=new int[n];
            for(int c=0;c<n;c++) a[c]=scan.nextInt();
            long best=Long.MAX_VALUE;
            for(int c=-200;c<200;c++) best=Math.min(best,calc(c));
            out.println(best);
        } t-->0 t-- t 0 {

            n=scan.nextInt();
            a=new int[n];
            for(int c=0;c<n;c++) a[c]=scan.nextInt();
            long best=Long.MAX_VALUE;
            for(int c=-200;c<200;c++) best=Math.min(best,calc(c));
            out.println(best);
        } n=scan.nextInt() n scan.nextInt() scan.nextInt scan a=new int[n] a new int[n] n for(int c=0;c<n;c++) a[c]=scan.nextInt(); int c=0; int c=0; c 0 c<n c n c++ c++ c a[c]=scan.nextInt(); a[c]=scan.nextInt() a[c] a c scan.nextInt() scan.nextInt scan long best=Long.MAX_VALUE; best Long.MAX_VALUE Long Long.MAX_VALUE for(int c=-200;c<200;c++) best=Math.min(best,calc(c)); int c=-200; int c=-200; c -200 200 c<200 c 200 c++ c++ c best=Math.min(best,calc(c)); best=Math.min(best,calc(c)) best Math.min(best,calc(c)) Math.min Math best calc(c) calc c out.println(best) out.println out best out.close() out.close out String[] args args static long calc(int spot) {
        long ans=0;
        for(int c=0;c<n;c++) ans+=(spot-a[c])*(spot-a[c]);
        return ans;
    } calc {
        long ans=0;
        for(int c=0;c<n;c++) ans+=(spot-a[c])*(spot-a[c]);
        return ans;
    } long ans=0; ans 0 for(int c=0;c<n;c++) ans+=(spot-a[c])*(spot-a[c]); int c=0; int c=0; c 0 c<n c n c++ c++ c ans+=(spot-a[c])*(spot-a[c]); ans+=(spot-a[c])*(spot-a[c]) ans (spot-a[c])*(spot-a[c]) (spot-a[c]) spot a[c] a c (spot-a[c]) spot a[c] a c return ans; ans int spot spot public static class MyScanner {
        BufferedReader br;
        StringTokenizer st;

        public MyScanner() {
            br = new BufferedReader(new InputStreamReader(System.in));
        }

        String next() {
            while (st == null || !st.hasMoreElements()) {
                try {
                    st = new StringTokenizer(br.readLine());
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
            return st.nextToken();
        }

        int nextInt() {
            return Integer.parseInt(next());
        }

        long nextLong() {
            return Long.parseLong(next());
        }

        double nextDouble() {
            return Double.parseDouble(next());
        }

        String nextLine() {
            String str = "";
            try {
                str = br.readLine();
            } catch (IOException e) {
                e.printStackTrace();
            }
            return str;
        }
    } MyScanner BufferedReader br; br StringTokenizer st; st public MyScanner() {
            br = new BufferedReader(new InputStreamReader(System.in));
        } MyScanner {
            br = new BufferedReader(new InputStreamReader(System.in));
        } br = new BufferedReader(new InputStreamReader(System.in)) br new BufferedReader(new InputStreamReader(System.in)) String next() {
            while (st == null || !st.hasMoreElements()) {
                try {
                    st = new StringTokenizer(br.readLine());
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
            return st.nextToken();
        } next {
            while (st == null || !st.hasMoreElements()) {
                try {
                    st = new StringTokenizer(br.readLine());
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
            return st.nextToken();
        } while (st == null || !st.hasMoreElements()) {
                try {
                    st = new StringTokenizer(br.readLine());
                } catch (IOException e) {
                    e.printStackTrace();
                }
            } st == null || !st.hasMoreElements() st == null st null !st.hasMoreElements() st.hasMoreElements() st.hasMoreElements st {
                try {
                    st = new StringTokenizer(br.readLine());
                } catch (IOException e) {
                    e.printStackTrace();
                }
            } try {
                    st = new StringTokenizer(br.readLine());
                } catch (IOException e) {
                    e.printStackTrace();
                } catch (IOException e) {
                    e.printStackTrace();
                } IOException e {
                    e.printStackTrace();
                } e.printStackTrace() e.printStackTrace e {
                    st = new StringTokenizer(br.readLine());
                } st = new StringTokenizer(br.readLine()) st new StringTokenizer(br.readLine()) return st.nextToken(); st.nextToken() st.nextToken st int nextInt() {
            return Integer.parseInt(next());
        } nextInt {
            return Integer.parseInt(next());
        } return Integer.parseInt(next()); Integer.parseInt(next()) Integer.parseInt Integer next() next long nextLong() {
            return Long.parseLong(next());
        } nextLong {
            return Long.parseLong(next());
        } return Long.parseLong(next()); Long.parseLong(next()) Long.parseLong Long next() next double nextDouble() {
            return Double.parseDouble(next());
        } nextDouble {
            return Double.parseDouble(next());
        } return Double.parseDouble(next()); Double.parseDouble(next()) Double.parseDouble Double next() next String nextLine() {
            String str = "";
            try {
                str = br.readLine();
            } catch (IOException e) {
                e.printStackTrace();
            }
            return str;
        } nextLine {
            String str = "";
            try {
                str = br.readLine();
            } catch (IOException e) {
                e.printStackTrace();
            }
            return str;
        } String str = ""; str "" try {
                str = br.readLine();
            } catch (IOException e) {
                e.printStackTrace();
            } catch (IOException e) {
                e.printStackTrace();
            } IOException e {
                e.printStackTrace();
            } e.printStackTrace() e.printStackTrace e {
                str = br.readLine();
            } str = br.readLine() str br.readLine() br.readLine br return str; str public class Main {
    public static MyScanner scan;
    public static PrintWriter out;
    public static void main(String[] args) {
        scan=new MyScanner();
        out=new PrintWriter(new BufferedOutputStream(System.out));

        int t=1;
//        int t=scan.nextInt();
        while(t-->0) {

            n=scan.nextInt();
            a=new int[n];
            for(int c=0;c<n;c++) a[c]=scan.nextInt();
            long best=Long.MAX_VALUE;
            for(int c=-200;c<200;c++) best=Math.min(best,calc(c));
            out.println(best);
        }
        out.close();
    }

    static int n;
    static int[] a;
    static long calc(int spot) {
        long ans=0;
        for(int c=0;c<n;c++) ans+=(spot-a[c])*(spot-a[c]);
        return ans;
    }

    //scanner
    public static class MyScanner {
        BufferedReader br;
        StringTokenizer st;

        public MyScanner() {
            br = new BufferedReader(new InputStreamReader(System.in));
        }

        String next() {
            while (st == null || !st.hasMoreElements()) {
                try {
                    st = new StringTokenizer(br.readLine());
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
            return st.nextToken();
        }

        int nextInt() {
            return Integer.parseInt(next());
        }

        long nextLong() {
            return Long.parseLong(next());
        }

        double nextDouble() {
            return Double.parseDouble(next());
        }

        String nextLine() {
            String str = "";
            try {
                str = br.readLine();
            } catch (IOException e) {
                e.printStackTrace();
            }
            return str;
        }
    }
} public class Main {
    public static MyScanner scan;
    public static PrintWriter out;
    public static void main(String[] args) {
        scan=new MyScanner();
        out=new PrintWriter(new BufferedOutputStream(System.out));

        int t=1;
//        int t=scan.nextInt();
        while(t-->0) {

            n=scan.nextInt();
            a=new int[n];
            for(int c=0;c<n;c++) a[c]=scan.nextInt();
            long best=Long.MAX_VALUE;
            for(int c=-200;c<200;c++) best=Math.min(best,calc(c));
            out.println(best);
        }
        out.close();
    }

    static int n;
    static int[] a;
    static long calc(int spot) {
        long ans=0;
        for(int c=0;c<n;c++) ans+=(spot-a[c])*(spot-a[c]);
        return ans;
    }

    //scanner
    public static class MyScanner {
        BufferedReader br;
        StringTokenizer st;

        public MyScanner() {
            br = new BufferedReader(new InputStreamReader(System.in));
        }

        String next() {
            while (st == null || !st.hasMoreElements()) {
                try {
                    st = new StringTokenizer(br.readLine());
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
            return st.nextToken();
        }

        int nextInt() {
            return Integer.parseInt(next());
        }

        long nextLong() {
            return Long.parseLong(next());
        }

        double nextDouble() {
            return Double.parseDouble(next());
        }

        String nextLine() {
            String str = "";
            try {
                str = br.readLine();
            } catch (IOException e) {
                e.printStackTrace();
            }
            return str;
        }
    }
} Main
import java.io.*;
import java.util.*;
import java.lang.*;

public class Main {
    public static MyScanner scan;
    public static PrintWriter out;
    public static void main(String[] args) {
        scan=new MyScanner();
        out=new PrintWriter(new BufferedOutputStream(System.out));

        int t=1;
//        int t=scan.nextInt();
        while(t-->0) {

            n=scan.nextInt();
            a=new int[n];
            for(int c=0;c<n;c++) a[c]=scan.nextInt();
            long best=Long.MAX_VALUE;
            for(int c=-200;c<200;c++) best=Math.min(best,calc(c));
            out.println(best);
        }
        out.close();
    }

    static int n;
    static int[] a;
    static long calc(int spot) {
        long ans=0;
        for(int c=0;c<n;c++) ans+=(spot-a[c])*(spot-a[c]);
        return ans;
    }

    //scanner
    public static class MyScanner {
        BufferedReader br;
        StringTokenizer st;

        public MyScanner() {
            br = new BufferedReader(new InputStreamReader(System.in));
        }

        String next() {
            while (st == null || !st.hasMoreElements()) {
                try {
                    st = new StringTokenizer(br.readLine());
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
            return st.nextToken();
        }

        int nextInt() {
            return Integer.parseInt(next());
        }

        long nextLong() {
            return Long.parseLong(next());
        }

        double nextDouble() {
            return Double.parseDouble(next());
        }

        String nextLine() {
            String str = "";
            try {
                str = br.readLine();
            } catch (IOException e) {
                e.printStackTrace();
            }
            return str;
        }
    }
}