def x10(st, n=4):
    if st[0] == "-": return -x10(st[1:], n)
    if "." not in st: return int(st) * 10 ** n
    a = st.find(".")
    return int(st[:a]) * 10 ** n + int("0" + st[a+1:]) * 10 ** (n - len(st) + a + 1)

def gcd(a, b):
    while b: a, b = b, a % b
    return a

a = x10(input(), 8)
b = 10 ** 8
g = gcd(a, b)
print(str(a // g) + "/" + str(b // g))