#include <iostream>
using namespace std;
int main(){
    string S,count_A,count_B;
    cin>>S;
    int S_length=S.length();
    bool Push_to_count_B=false;
    for(int i=0;i<S_length;i++){
        if(S.at(i)=='/'){
            Push_to_count_B=true;
            continue;
        }
        if(!Push_to_count_B){
            count_A.push_back(S.at(i));
        }
        if(Push_to_count_B){
            count_B.push_back(S.at(i));
        }
    }
    double A,B;
    A=stod(count_A);
    B=stod(count_B);
    double ans=A/B;
    cout<<ans<<endl;
    return 0;
}