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 hgstcmnfactr(l, m):
    lst = set()
    mst = set()
    for i in range(1, l+1):
        if l % i == 0:
            lst.add(i)
    for j in range(1, m+1):
        if m % j == 0:
            mst.add(j)
    return max(lst & mst)


mn = max(list(map(int, input().split(" "))))
chns = 7-mn
print(str(int(chns/hgstcmnfactr(chns, 6))) + "/" + str(int(6/hgstcmnfactr(chns, 6))))
