import fractions
from functools import lru_cache
@lru_cache(maxsize=None)
def solve(N):
    if N==0:
        return fractions.Fraction(1,10)
    if N==1:
        return fractions.Fraction(0)
    if N==2:
        return solve(N-1)+10*solve(N-2)+1
    if N>0:
        return solve(N-1)+10*solve(N-2)+1
    if N<0:
        return (-solve(N+1)-solve(N+2))/10
N=int(input())
ans=solve(N)
print(ans.numerator,"/",ans.denominator,sep="")