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

vector<ll> dx = { 0, 0, -1, 1};
vector<ll> dy = {-1, 1,  0, 0};

#define MOD 1000000007
int main() {
    string S;
    cin >> S;
    int a, b;
    bool isA = true;
    string A, B;
    for (int i=0; i<S.size(); i++) {
        if (S[i]=='/') { isA = false; }
        else {
            if (isA) {
                A.push_back(S[i]);
            } else {
                B.push_back(S[i]);
            }
        }
    }
    a = stoi(A);
    b = stoi(B);

    double ret = (double)a/b;
    printf("%.15f\n", ret);
    return 0;
}