import sys
from fractions import *
input = sys.stdin.readline
def multiple_ten(s, d):
  # float with error -> int without error
  if not "." in s: return int(s) * 10 ** d
  x, r = s.split(".")
  return int(x) * 10 ** d + int(r) * 10 ** (d - len(r))

X = input()[: -1]
d = 8
res = str(Fraction(multiple_ten(X, d)) / Fraction(10 ** d))
if "." in res: print(res)
else: print(res + "/1")