public static void main ( String [ ] args ) {
  Scanner in = new Scanner ( System . in ) ;
  int y = in . nextInt ( ) ;
  int w = in . nextInt ( ) ;
  int favOutcomes = 0 ;
  for ( int i = Math . max ( y , w ) ;
  i <= 6 ;
  i ++ ) ++ favOutcomes ;
  int gcd = 0 ;
  for ( int i = 1 ;
  i <= favOutcomes && i <= 6 ;
  i ++ ) {
    if ( favOutcomes % i == 0 && 6 % i == 0 ) gcd = i ;
  }
  System . out . println ( favOutcomes / gcd + "/" + 6 / gcd ) ;
}

public static void main ( String [ ] args ) { Scanner in = new Scanner ( System . in ) ; int y = in . nextInt ( ) ; int w = in . nextInt ( ) ; int favOutcomes = 0 ; for ( int i = Math . max ( y , w ) ; i <= 6 ; i ++ ) ++ favOutcomes ; int gcd = 0 ; for ( int i = 1 ; i <= favOutcomes && i <= 6 ; i ++ ) { if ( favOutcomes % i == 0 && 6 % i == 0 ) gcd = i ; } System . out . println ( favOutcomes / gcd + " / " + 6 / gcd ) ; }
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