# 1464 Number Conversion

from sys import stdin

def dividePossibleTimes(x,n):
    t=0
    while True:
        x=x/n
        if not x.is_integer():
            break
        t+=1
    return t

x=float(stdin.readline())

decpart=x-int(x)
integer=x-decpart
if decpart==0:
    print('{}/1'.format(int(integer)))
    exit()
denominator=10**(len(format(decpart))-2)

decpart=format(decpart)[2:]
dp=int(decpart)

min2=min(dividePossibleTimes(dp,2),dividePossibleTimes(int(denominator),2))
min5=min(dividePossibleTimes(dp,5),dividePossibleTimes(int(denominator),5))

denominator=denominator/(2**min2)
dp=dp/(2**min2)
denominator=denominator/(5**min5)
dp=dp/(5**min5)

print('{0}/{1}'.format(int(integer*denominator+dp),int(denominator)))