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.io.*;
import java.util.*;

public class DieRoll {

	public static void main(String[] args) {
		Scanner in = new Scanner(System.in);
		String str = in.nextLine();
		int a = Integer.parseInt(""+str.charAt(0));
		int b = Integer.parseInt(""+str.charAt(2));
		int max;
		max = (a>=b)?a:b;
		int numerator, denominator;
		int cases = 6 - max + 1;
		numerator = cases;
		denominator = 6;
		if(numerator == 1)
			System.out.print("1/6");
		else if(numerator == 2)
			System.out.print("1/3");
		else if(numerator == 3)
			System.out.print("1/2");
		else if(numerator == 4)
			System.out.print("2/3");
		else if(numerator == 5)
			System.out.print("5/6");
		else if(numerator == 6)
			System.out.print("1");
	}
}

