import math
import random

hits = 0
n = 10000000
for i in range(0,n):
    rolls = []
    for j in range(0,8):
        rolls.append(int(math.ceil(random.random()*6)))

    if len(set(rolls[0:7])) <= 2 or len(set(rolls[1:8])) <= 2:
        hits += 1

print "%s/%s" %(hits,n)