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 = str(input())
thedice = []
target = 1
for letter in x:
  if letter != " ":
    thedice.append(int(letter))
thedie = max(thedice)
dot = 1
canwin = 0
while dot <= 6:
  if dot >= thedie:
    canwin += 1
  dot += 1
string = str(canwin) + "/6"
if string == "1/6":
  result = "1/6"
if string == "2/6":
  result = "1/3"
if string == "3/6":
  result = "1/2"
if string == "4/6":
  result = "2/3"
if string == "5/6":
  result = "5/6"
if string == "6/6":
  result = "1/1"
print(result)