public static void main ( String [ ] args ) {
  Scanner sc = new Scanner ( System . in ) ;
  int N = sc . nextInt ( ) ;
  int a [ ] = new int [ N ] ;
  for ( int i = 0 ;
  i < N ;
  i ++ ) {
    a [ i ] = sc . nextInt ( ) ;
  }
  Arrays . sort ( a ) ;
  int start = a [ 0 ] ;
  int end = a [ a . length - 1 ] ;
  int sum = Integer . MAX_VALUE ;
  for ( int i = start ;
  i <= end ;
  i ++ ) {
    int ans = 0 ;
    for ( int j = 0 ;
    j < N ;
    j ++ ) {
      ans += ( a [ j ] - i ) * ( a [ j ] - i ) ;
    }
    sum = Math . min ( sum , ans ) ;
  }
  System . out . println ( sum ) ;
}

public static void main ( String [ ] args ) { Scanner sc = new Scanner ( System . in ) ; int N = sc . nextInt ( ) ; int a [ ] = new int [ N ] ; for ( int i = 0 ; i < N ; i ++ ) { a [ i ] = sc . nextInt ( ) ; } Arrays . sort ( a ) ; int start = a [ 0 ] ; int end = a [ a . length - 1 ] ; int sum = Integer . MAX_VALUE ; for ( int i = start ; i <= end ; i ++ ) { int ans = 0 ; for ( int j = 0 ; j < N ; j ++ ) { ans += ( a [ j ] - i ) * ( a [ j ] - i ) ; } sum = Math . min ( sum , ans ) ; } System . out . println ( sum ) ; }
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