#include <bits/stdc++.h>
#define rep(i,n) for(int i = 0; i < (n); i++)
using namespace std;
typedef long long ll;

int main(){
    cin.tie(0);
    ios::sync_with_stdio(0);
    
    using ld = long double;
    ld X; cin >> X;
    ll S = roundl(X * ld(1e8)), B = 1e8;
    ll G = gcd(S, B);
    S /= G, B /= G;
    cout << S << "/" << B << endl;
}