from sys import stdin
from fractions import Fraction

input = stdin.readline


n = int(input())
if n > 0:
    print("0/1")
elif n < 0:
    n *= -1
    a = [Fraction(0) for i in range(n + 1)]
    a[0] = Fraction(1, 10)
    a[1] = Fraction(-1, 100)
    for i in range(2, n + 1):
        a[i] = -(a[i - 1] + a[i - 2]) / 10
    ans_x, ans_y = a[n].numerator, a[n].denominator
    mul = 10**20 // ans_y
    ans_x *= mul
    ans_y *= mul
    print(ans_x, ans_y, sep="/")
else:
    print("1/10")