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.Arrays;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.BufferedReader;
import java.io.OutputStream;
import java.io.PrintWriter;
import java.util.Comparator;
import java.io.IOException;
import java.util.StringTokenizer;
import java.math.*;
import java.util.*;

public class A
{
    public static void main(String[]args)
    {
        InputStream inputStream = System.in;
        OutputStream outputStream = System.out;
        InputReader in = new InputReader(inputStream);
        PrintWriter out = new PrintWriter(outputStream);
        TaskX solver = new TaskX();
        solver.solve(1,in,out);
        out.close();
    }
}

class TaskX
{
    public void solve(int testNumber, InputReader in, PrintWriter out)
    {
       	int a = in.nextInt();
        int b = in.nextInt();
        a = Math.max(a,b);
        a = 7-a;
        int den = 6;
        for(int i=1;i<=6;++i)
        {
            if(a%i==0 && den%i==0)
            {
                a/=i;
                den/=i;
            }
        }
        out.println(a+"/"+den);
    }
}






























class InputReader
{
    public BufferedReader reader;
    public StringTokenizer tokenizer;
    public InputReader(InputStream stream){
        reader = new BufferedReader(new InputStreamReader(stream), 32768);
        tokenizer = null;
    }
    public String next(){
        while (tokenizer == null || !tokenizer.hasMoreTokens()){
            try{
                tokenizer = new StringTokenizer(reader.readLine());
            }
            catch (IOException e){
                throw new RuntimeException(e);
            }
        }
        return tokenizer.nextToken();
    }
    public int nextInt() {
        return Integer.parseInt(next());
    }
}