#include<bits/stdc++.h>
using namespace std;
using u64 = uint_least64_t;
using s64 = int_least64_t;
using ll = uint_least64_t;

int main(){
	string xs, us, ds;
	cin >> xs;
    int pos = xs.find(".");
    // cout << pos << endl;
    if (pos < 0){
        cout << xs << "/1" << endl;
        return 0;
    }
    us = xs.substr(0, pos);
    // cout << "us=" << us << endl;
    ds = xs.substr(pos + 1, xs.length() - pos-1);
    // cout << "ds=" << ds << endl;
    string ts = us + ds;
    // cout << "ts=" << ts << endl;
    u64 tsi = atoi(ts.c_str());
    u64 b = pow(10, ds.length());
    if (tsi % 2 == 0){
        tsi /= 2;
        b /= 2;
    }
    if (tsi % 5 == 0){
        tsi /= 5;
        b /= 5;
    }

	cout << tsi << "/"<< b << endl;
	return 0;
}