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

#!/System/Volumes/Data/anaconda3/bin/python

# -*- coding: utf-8 -*-
# @Author: Andres Nowak
# @Date: Sat Feb 15 13:30:16 CST 2020

from fractions import Fraction

throws_of_dice = [int(i) for i in input().split()]

maximum = max(throws_of_dice)
higher_numbers_that_can_get = 7 - maximum

probability = Fraction(higher_numbers_that_can_get, 6)

if probability == 0:
    probability = "0/1"
if probability == 1:
    probability = "1/1"
print(probability)

# O poner todas las probabilidades a mano
