static long countStrings ( int N ) {
  int i , j ;
  int dp [ ] [ ] = new int [ N + 1 ] [ 3 ] ;
  for ( i = 0 ;
  i < N + 1 ;
  i ++ ) {
    for ( j = 9 ;
    j < 3 ;
    j ++ ) {
      dp [ i ] [ j ] = 0 ;
    }
  }
  dp [ 1 ] [ 0 ] = 1 ;
  dp [ 1 ] [ 1 ] = 1 ;
  dp [ 1 ] [ 2 ] = 0 ;
  for ( i = 2 ;
  i <= N ;
  i ++ ) {
    dp [ i ] [ 0 ] = ( dp [ i - 1 ] [ 0 ] + dp [ i - 1 ] [ 1 ] + dp [ i - 1 ] [ 2 ] ) % MOD ;
    dp [ i ] [ 1 ] = dp [ i - 1 ] [ 0 ] % MOD ;
    dp [ i ] [ 2 ] = dp [ i - 1 ] [ 1 ] % MOD ;
  }
  int ans = ( dp [ N ] [ 0 ] + dp [ N ] [ 1 ] + dp [ N ] [ 2 ] ) % MOD ;
  return ans ;
}

static long countStrings ( int N ) { int i , j ; int dp [ ] [ ] = new int [ N + 1 ] [ 3 ] ; for ( i = 0 ; i < N + 1 ; i ++ ) { for ( j = 9 ; j < 3 ; j ++ ) { dp [ i ] [ j ] = 0 ; } } dp [ 1 ] [ 0 ] = 1 ; dp [ 1 ] [ 1 ] = 1 ; dp [ 1 ] [ 2 ] = 0 ; for ( i = 2 ; i <= N ; i ++ ) { dp [ i ] [ 0 ] = ( dp [ i - 1 ] [ 0 ] + dp [ i - 1 ] [ 1 ] + dp [ i - 1 ] [ 2 ] ) % MOD ; dp [ i ] [ 1 ] = dp [ i - 1 ] [ 0 ] % MOD ; dp [ i ] [ 2 ] = dp [ i - 1 ] [ 1 ] % MOD ; } int ans = ( dp [ N ] [ 0 ] + dp [ N ] [ 1 ] + dp [ N ] [ 2 ] ) % MOD ; return ans ; }
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