#include <iostream>
#include <vector>
#include <algorithm>
#include <functional>
#include <queue>
#include <map>
#include <cmath>
#include <iomanip>
#include <set>
#include <cstdio>
#include <string>

using namespace std;

int main() {
  cout << fixed << setprecision(15);
  string s;
  cin >> s;
  int a = 0;
  int b = 0;
  bool f = false;
  for (int i = 0; i < s.size(); i++) {
    if ('0' <= s[i] && s[i] <= '9') {
      if (!f) {
        a = 10 * a + (s[i] - '0');
      } else {
        b = 10 * b + (s[i] - '0');
      }
    } else {
      f = !f;
    }
  }
  cout << (long double)a / b << endl;
  return 0;
}