#include <iostream>
#include <iomanip>
using namespace std;

int main()
{
    string s;
    cin >> s;
    string delimiter = "/";
    size_t pos = 0;
    string t;
    while ((pos = s.find(delimiter)) != string::npos)
    {
        t = s.substr(0, pos);
        s.erase(0, pos + delimiter.length());
    }
    cout << fixed << setprecision(20);
    cout << stof(t) / stof(s) << endl;
}