public static void main ( String [ ] args ) {
  int INF = 100000000 ;
  Scanner sc = new Scanner ( System . in ) ;
  int n = sc . nextInt ( ) ;
  int m = sc . nextInt ( ) ;
  int [ ] dp = new int [ n + 1 ] ;
  int [ ] a = new int [ m ] ;
  for ( int i = 0 ;
  i < m ;
  i ++ ) {
    a [ i ] = sc . nextInt ( ) ;
  }
  int [ ] cost = {
    0 , 2 , 5 , 5 , 4 , 5 , 6 , 3 , 7 , 6 };
    Arrays . sort ( a ) ;
    Arrays . fill ( dp , - INF ) ;
    dp [ 0 ] = 0 ;
    for ( int i = 1 ;
    i <= n ;
    i ++ ) {
      for ( int j = m - 1 ;
      j >= 0 ;
      j -- ) {
        if ( i - cost [ a [ j ] ] < 0 ) continue ;
        else dp [ i ] = Math . max ( dp [ i ] , dp [ i - cost [ a [ j ] ] ] + 1 ) ;
      }
    }
    StringBuilder ans = new StringBuilder ( ) ;
    while ( n != 0 ) {
      for ( int j = m - 1 ;
      j >= 0 ;
      j -- ) {
        if ( cost [ a [ j ] ] > n ) continue ;
        if ( dp [ n - cost [ a [ j ] ] ] == dp [ n ] - 1 ) {
          ans . append ( a [ j ] ) ;
          n -= cost [ a [ j ] ] ;
          break ;
        }
      }
    }
    System . out . println ( ans ) ;
  }
  
public static void main ( String [ ] args ) { int INF = 100000000 ; Scanner sc = new Scanner ( System . in ) ; int n = sc . nextInt ( ) ; int m = sc . nextInt ( ) ; int [ ] dp = new int [ n + 1 ] ; int [ ] a = new int [ m ] ; for ( int i = 0 ; i < m ; i ++ ) { a [ i ] = sc . nextInt ( ) ; } int [ ] cost = { 0 , 2 , 5 , 5 , 4 , 5 , 6 , 3 , 7 , 6 } ; Arrays . sort ( a ) ; Arrays . fill ( dp , - INF ) ; dp [ 0 ] = 0 ; for ( int i = 1 ; i <= n ; i ++ ) { for ( int j = m - 1 ; j >= 0 ; j -- ) { if ( i - cost [ a [ j ] ] < 0 ) continue ; else dp [ i ] = Math . max ( dp [ i ] , dp [ i - cost [ a [ j ] ] ] + 1 ) ; } } StringBuilder ans = new StringBuilder ( ) ; while ( n != 0 ) { for ( int j = m - 1 ; j >= 0 ; j -- ) { if ( cost [ a [ j ] ] > n ) continue ; if ( dp [ n - cost [ a [ j ] ] ] == dp [ n ] - 1 ) { ans . append ( a [ j ] ) ; n -= cost [ a [ j ] ] ; break ; } } } System . out . println ( ans ) ; }
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