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 max1(a):
	p = a[0]
	for x in a:
		if x > p:
			p = x
	return p


def prlist(a):
	for x in a:
		print(x, end = " ")
			

def fakt(n):
	p = 1
	for i in range(1, n + 1):
		p *= i
	return p

			
#row, col = list(map(int, input().split()))
#a = list(map(int, input().split()))
a = list(map(int, input().split()))
k = max(a)
t = 0
for i in range(1, 7):
	if i >= k:
		t += 1
p = 6
for i in range(6, 1, -1):
	if p % i == 0 and t % i == 0:
		p //= i
		t //= i
print(t, "/", p, sep = "")
		
		
		
