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.*;
public class Temp
{
    public static void main(String[] args) 
    {
        Scanner uInput=new Scanner (System.in);
        int x=uInput.nextInt();
        int y=uInput.nextInt();
        if(y>x)
            x=y;
        int times=7-x;
        int fraction2=6;
        while(times!=1 && fraction2%times == 0 && times!=fraction2)
        {
            fraction2/=times;
            times/=2;
        }
        if(fraction2==times)
            System.out.println("1/1");
        else
            System.out.println(times+"/"+fraction2);
    }
}