#include <bits/stdc++.h>
#include <atcoder/all>
using mint = atcoder::static_modint<998244353>;
//using mint = atcoder::static_modint<1000000007>;
using namespace std;
using namespace atcoder;
using ld = long double;
using ll = long long;
#define mp(a,b) make_pair(a,b)
#define rep(i,s,n) for(int i=s; i<n; i++)
const vector<int> dx{1,0,-1,0},dy{0,1,0,-1};

string to_s(__int128_t x){
    string s;
    bool minus=false;
    if(x<0)minus=true,x=-x;
    while(x){
        s+='0'+x%10;
        x/=10;
    }
    reverse(s.begin(),s.end());
    if(minus)s='-'+s;
    return s;
}
int main(){
    int n;
    cin >> n;
    if(n>=1){
        cout << "0/1";
        return 0;
    }
    n=-n;
    vector<__int128_t> x(22);
    x[1]=1;
    rep(i,2,22){
        x[i]=-x[i-1]-10*x[i-2];
    }
    rep(i,0,22)if(i%2==0)x[i]*=-1;
    cout << to_s(x[n+1]) << "/" << 1 << string(n+1,'0');
}