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

rolls = input()

rolls = rolls.split()

highest = 0

for i in rolls:
	if int(i) > highest:
		highest = int(i)

remaining = 6 - highest + 1 

if(remaining == 6):
	print ("1/1")

else:
	if(6/remaining == 2):
		print ("1/2")

	elif(6/remaining == 3):
		print ("1/3")

	elif(remaining == 4):
		print("2/3")

	else:
		print (str(remaining) + "/" + "6")
   	   	   			   	  			 	 	  	