6 6
 1 4
 4 4
 3 3
 6 4
 6 3
 5 4
 5 6
 3 4
 1 3
 3 2
 5 5
 1 1
 2 1
 3 1
 3 5
 1 6
 6 5
 2 3
 4 3
 2 2
 3 6
 1 2
 6 1
 2 5
 4 5
 1 5
 6 2
 4 6
 5 1
 4 1
 5 2
 2 4
 2 6
 5 3

1/6
 1/2
 1/2
 2/3
 1/6
 1/6
 1/3
 1/6
 1/2
 2/3
 2/3
 1/3
 1/1
 5/6
 2/3
 1/3
 1/6
 1/6
 2/3
 1/2
 5/6
 1/6
 5/6
 1/6
 1/3
 1/3
 1/3
 1/6
 1/6
 1/3
 1/2
 1/3
 1/2
 1/6
 1/3

import java.util.Scanner;
public class Main {
    public static void main(String []arges){
   Scanner input = new Scanner (System.in);
   int a = input.nextInt();
   int b = input.nextInt();
   int count=0;
   if (a>b){
       while(a!=7){
      count++;     a++;
       } 
   }
    else {
       while(b!=7){
      count++;     b++;
       }
   }
   if(count == 1)
    System.out.println("1/6");
   else if (count==2) 
      System.out.println( "1/3");
 else if (count==3) 
      System.out.println( "1/2");
   
  else if (count==4) 
      System.out.println( "2/3");
    else if (count==5)  
      System.out.println( "5/6");
    else if (count==6) 
      System.out.println( "1/1");
    }}