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

x = list(map(int, input().split()))
# She wins if she gets a number equal to or higher than the highest number they've got
prob = (6 - max(x) + 1) / 6

probs = {1/6: '1/6', 1/3: '1/3', 1/2: '1/2', 2/3: '2/3', 5/6: '5/6', 1: '1/1'}

print(probs[prob])
# for i in probs:
#     if prob == i:
#         print(probs[i])
#         break
