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

def find_greatest(arr):
    gr = arr[0]
    gr_index = 0

    for i in range(len(arr)):
        if arr[i] > gr:
            gr = arr[i]
            gr_index = i

    return gr_index


def cut(a, b):
    # a lesss than b
    if b % a == 0:
        b /= a
        a /= a
    elif b % 2 == 0 and a % 2 == 0:
        b /= 2
        a /= 2
    elif b % 3 == 0 and a % 3 == 0:
        b /= 3
        a /= 3
    else:
        pass

    return ("{}/{}".format(int(a), int(b)))


throws = list(map(int, input().split(" ")))

big = throws[find_greatest(throws)]

need_cnt = 7 - big

print(cut(need_cnt, 6))
