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

# https://codeforces.com/problemset/problem/9/A
import sys
#-----------------------------------------------------------------------------#
# comment before submission
# sys.stdin = open('inputs.txt', 'r')
# sys.stdout = open('output.txt', 'w')
#-----------------------------------------------------------------------------#
input = sys.stdin.readline
print = sys.stdout.write


def hcf(x1, x2):
    x1, x2 = max(x1, x2), min(x1, x2)
    while x1 % x2:
        x1, x2 = x2, x1 % x2

    return x2


d1 = max(map(int, input().split()))
total_cases = 6
fav_cases = total_cases - d1 + 1

nume = fav_cases//hcf(fav_cases, total_cases)
deno = total_cases // hcf(fav_cases, total_cases)

print(f'{nume}/{deno}')
