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

int main(){
  double x; cin >> x;
  ll n = round(x*100000000);
  ll m = 100000000;
  ll g = gcd(n, m);
  n /= g;
  m /= g;
  cout << n << "/" << m << endl;
  return 0;
}