public static void main ( String [ ] args ) {
  Scanner sc = new Scanner ( System . in ) ;
  int a = sc . nextInt ( ) ;
  long sum = 0 ;
  int d = 0 ;
  int b = a ;
  for ( int i = 2 ;
  i < b ;
  i ++ ) {
    int x = 0 ;
    while ( a != 0 ) {
      x = x + a % i ;
      a = a / i ;
    }
    sum = sum + x ;
    a = b ;
    d ++ ;
  }
  for ( int j = 2 ;
  j < d ;
  j ++ ) {
    if ( ( sum % j == 0 ) && ( d % j == 0 ) ) {
      sum = sum / j ;
      d = d / j ;
      j -- ;
    }
  }
  System . out . println ( sum + "/" + d ) ;
}

public static void main ( String [ ] args ) { Scanner sc = new Scanner ( System . in ) ; int a = sc . nextInt ( ) ; long sum = 0 ; int d = 0 ; int b = a ; for ( int i = 2 ; i < b ; i ++ ) { int x = 0 ; while ( a != 0 ) { x = x + a % i ; a = a / i ; } sum = sum + x ; a = b ; d ++ ; } for ( int j = 2 ; j < d ; j ++ ) { if ( ( sum % j == 0 ) && ( d % j == 0 ) ) { sum = sum / j ; d = d / j ; j -- ; } } System . out . println ( sum + " / " + d ) ; }
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