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

import math
def ptich(a):
      arr = []
      b = 5
      for i in range(2,int(a/2) + 1):
            while(a % i == 0):
                a /= i
                arr.append(i)
      if(arr):
            return arr
      else:
            return a
            
                  
            


sub = list(map(int,input().split()))
win = max(sub)
tu = 7 - win
mau = 6
tuR = str(ptich(tu))
mauR = ptich(mau)

for i in mauR:
      if(tuR.find(str(i)) != -1):
            mau /= i
            tu /= i
print(str(int(tu)) + '/' + str(int(mau)))






      
