n = float(input())

m = [n , 1]
n_s = format(m[0], '.8f')

for i in range(8):
    ln = int(n_s[-(i + 1)])
    if ln == 0:
        continue
    if ln % 2 == 0:
        k = 5
    elif ln == 5:
        k =2
    else:
        k = 10
    m = [k * m[0], k * m[1]]
    n_s = format(m[0], '.8f')

print(str(int(m[0])) + '/' + str(m[1]))