from math import gcd

def calulate_probability(max_sum,side=6): total_outcome=side * side favourable = 0

for i in range(1,side+1):
    for j in range(1,side+1):
        if i + j <=max_sum:
            favourable += 1

divisor = gcd(favourable,total_outcome)
numerator= favourable//divisor
denominator = total_outcome//divisor

return f"{numerator}//{denominator}"

x=int(input()) print("total_outcome:",calulate_probability(x))