#include <bits/stdc++.h>
using namespace std;
using ch = char;
using ll = long long;
using ld = long double;
using db = double;
using st = string;
using vdb = vector<db>;
using vvdb = vector<vdb>;
using vl = vector<ll>;
using vvl = vector<vl>;
using vd = vector<ld>;
using vvd = vector<vd>;
using vs = vector<st>;
using vvs = vector<vs>;
using vc = vector<ch>;
using vvc = vector<vc>;
using vb = vector<bool>;
using vvb = vector<vb>;
const ll mod1 = 998244353;
const ll mod2 = 1000000007;

int main(){
  st S;
  cin>>S;
  st A,B;
  ll a=0;
  while(1){
    if(S.at(a)=='/')
      break;
    A+=S.at(a);
    a++;
  }
  a++;
  while(a!=S.size()){
    B+=S.at(a);
    a++;
  }
  db X=stod(A);
  db Y=stod(B);
  cout<<X/Y<<endl;
}