#include <iostream>
using namespace std;

unsigned long long gcd(long a, long b) {
    return b == 0 ? a : gcd(b, a % b);
}

int main(int argc, const char * argv[]) {

    unsigned long long v1,d1,v2,d2,iGcd,fTop,fBot,tL,tR;
    unsigned long long i = 1;
    while(cin >> v1 && v1 !=0){

        cin >> d1 >> v2 >> d2;


        fTop = (d2*v1)+(d1*v2);

        fBot = v1 * v2 * 2;

        iGcd = gcd(fTop, fBot);

        if(tR>tL){
            cout << "Case #" << i << ": You owe me a beer!" << endl;
            cout << "Avg. arrival time: " << (fTop/iGcd);
            if(iGcd != fBot){
                cout << "/" << (fBot/iGcd) << endl;
            }
            else{
                cout << endl;
            }
        }
        else {
            cout << "Case #" << i << ": No beer for the captain."<< endl;
            cout << "Avg. arrival time: " << (fTop/iGcd);
            if(iGcd != fBot){
                cout << "/" << (fBot/iGcd) << endl;
            }
            else{
                cout << endl;
            }
        }

        i++;
    }


    return 0;
}