#include <bits/stdc++.h>
using namespace std;

#define ll long long
#define rep(i, n) for (int i = 0; i < (n); i++)
#define P pair<int, int>

ll gcd(ll a, ll b) {
  return (a % b) ? gcd(b,a%b) : b;
}

int main() {
  double x;
  cin >> x;
  const ll c = 1e9;
  x *= c;
  x += 0.5;

  ll g = gcd((ll)x, c);
  cout << x/g << "/" << c/g << endl;


}