import cmath
import math
from fractions import Fraction

N = int(input())

M = 1 * 3 * 4 * 5 * 6 * 7 * 8 * 9 * 10

val = 0
for k in range(M):
    num = cmath.exp(2 * k * N * math.pi * 1j / M)
    dnm = cmath.exp(4 * k * math.pi * 1j / M)
    dnm += cmath.exp(2 * k * math.pi * 1j / M)
    dnm += 10
    val += num / dnm
val /= M
# print(val)

# これもだめ
dnm = 10**max(-N+1,0)
num = round(val.real * dnm)
print(num, dnm, sep='/')

# Fraction で有理数近似しようと思ったけど精度が足りない
# x = Fraction(val.real)
# y = x.limit_denominator(10**(-N+1))
# # print(y)

# y_num = y.numerator
# y_dnm = y.denominator

# tmp = y_dnm

# c2 = 0
# c5 = 0

# while tmp % 2 == 0:
#     c2 += 1
#     tmp //= 2
# while tmp % 5 == 0:
#     c5 += 1
#     tmp //= 5
# # print(c2, c5, tmp)

# if c2 > c5:
#     y_num *= 5**(c2-c5)
#     y_dnm *= 5**(c2-c5)
# elif c2 < c5:
#     y_num *= 2**(c5-c2)
#     y_dnm *= 2**(c5-c2)

# print(y_num, y_dnm, sep='/')