public static void main ( String args [ ] ) {
  Scanner input = new Scanner ( System . in ) ;
  int [ ] a = new int [ 6 ] ;
  int s = 0 , c = 0 ;
  for ( int i = 0 ;
  i < 6 ;
  i ++ ) {
    a [ i ] = input . nextInt ( ) ;
    s = s + a [ i ] ;
  }
  int s1 = s / 2 ;
  if ( s % 2 == 0 ) {
    for ( int i = 0 ;
    i < 6 ;
    i ++ ) {
      for ( int j = i + 1 ;
      j < 6 ;
      j ++ ) {
        for ( int k = j + 1 ;
        k < 6 ;
        k ++ ) {
          if ( a [ i ] + a [ j ] + a [ k ] == s1 ) {
            System . out . println ( "yes" ) ;
            c ++ ;
            break ;
          }
        }
        if ( c == 1 ) {
          break ;
        }
      }
      if ( c == 1 ) {
        break ;
      }
    }
    if ( c == 0 ) {
      System . out . println ( "no" ) ;
    }
  }
  else {
    System . out . println ( "no" ) ;
  }
}

public static void main ( String args [ ] ) { Scanner input = new Scanner ( System . in ) ; int [ ] a = new int [ 6 ] ; int s = 0 , c = 0 ; for ( int i = 0 ; i < 6 ; i ++ ) { a [ i ] = input . nextInt ( ) ; s = s + a [ i ] ; } int s1 = s / 2 ; if ( s % 2 == 0 ) { for ( int i = 0 ; i < 6 ; i ++ ) { for ( int j = i + 1 ; j < 6 ; j ++ ) { for ( int k = j + 1 ; k < 6 ; k ++ ) { if ( a [ i ] + a [ j ] + a [ k ] == s1 ) { System . out . println ( " yes " ) ; c ++ ; break ; } } if ( c == 1 ) { break ; } } if ( c == 1 ) { break ; } } if ( c == 0 ) { System . out . println ( " no " ) ; } } else { System . out . println ( " no " ) ; } }
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