public static void main ( String [ ] args ) {
  Scanner sc = new Scanner ( System . in ) ;
  int N = sc . nextInt ( ) ;
  long MOD = 1000000007 ;
  long [ ] dp = new long [ N + 1 ] ;
  dp [ 0 ] = 1 ;
  dp [ 1 ] = MOD - 1 ;
  long cur = 0 ;
  for ( int i = 0 ;
  i < N ;
  i ++ ) {
    cur = ( cur + dp [ i ] ) % MOD ;
    if ( i == N - 1 ) {
      dp [ N ] = ( dp [ N ] + cur * N ) % MOD ;
    }
    else {
      dp [ i + 1 ] = ( dp [ i + 1 ] + cur ) % MOD ;
      dp [ i + 2 ] = ( dp [ i + 2 ] - cur + MOD ) % MOD ;
      if ( i + 3 <= N ) {
        dp [ i + 3 ] = ( dp [ i + 3 ] + cur ) % MOD ;
        dp [ N ] = ( dp [ N ] + cur * ( i + 1 ) ) % MOD ;
      }
      else {
        dp [ N ] = ( dp [ N ] + cur * ( N - 1 ) ) % MOD ;
      }
      dp [ N ] = ( dp [ N ] + cur * ( ( ( ( long ) N - 1 ) * ( N - 1 ) ) % MOD ) ) % MOD ;
    }
  }
  System . out . println ( ( cur + dp [ N ] ) % MOD ) ;
  sc . close ( ) ;
}

public static void main ( String [ ] args ) { Scanner sc = new Scanner ( System . in ) ; int N = sc . nextInt ( ) ; long MOD = 1000000007 ; long [ ] dp = new long [ N + 1 ] ; dp [ 0 ] = 1 ; dp [ 1 ] = MOD - 1 ; long cur = 0 ; for ( int i = 0 ; i < N ; i ++ ) { cur = ( cur + dp [ i ] ) % MOD ; if ( i == N - 1 ) { dp [ N ] = ( dp [ N ] + cur * N ) % MOD ; } else { dp [ i + 1 ] = ( dp [ i + 1 ] + cur ) % MOD ; dp [ i + 2 ] = ( dp [ i + 2 ] - cur + MOD ) % MOD ; if ( i + 3 <= N ) { dp [ i + 3 ] = ( dp [ i + 3 ] + cur ) % MOD ; dp [ N ] = ( dp [ N ] + cur * ( i + 1 ) ) % MOD ; } else { dp [ N ] = ( dp [ N ] + cur * ( N - 1 ) ) % MOD ; } dp [ N ] = ( dp [ N ] + cur * ( ( ( ( long ) N - 1 ) * ( N - 1 ) ) % MOD ) ) % MOD ; } } System . out . println ( ( cur + dp [ N ] ) % MOD ) ; sc . close ( ) ; }
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