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;
import java.math.*;
/**
 * Created by Nowrin on 28-Aug-16.
 */
public class CF9A {
    public static void main(String[] args) {
        Scanner in = new Scanner(System.in);
        int W,Y,A,B,max,i,j;
         Y = in.nextInt();
        W = in.nextInt();
         max = (W>Y)?W:Y;

        i = 7-max;
        if (i==0) System.out.println(0+"/"+1);
        else {
            if(i%6==0)j=1;
            else if(i%2==0)j=2;
            else if(i%3==0)j=3;
            else j = 1;

            A = i/j;
            B = 6/j;

            System.out.println(A+"/"+B);
        }
    }
}
