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

# -*- coding: utf-8 -*-
"""
Created on Sun Jun 21 02:02:28 2020

@author: ElAhwel
"""

nums = list(map(int , input().split()))
prob = round( ((7-max(nums))/6) , 2)
count = 1
for i in range(1 , 7):
    for j in range (1 , 7):
        dev = round((i/j) , 2)
        sub = dev - prob
        if sub == 0 and count == 1:
            print('{}/{}'.format(i , j))
            count = 2 