#include<iostream>
#include<fstream>

using namespace std;

int main()
{
    ifstream  input("dragon.in");
    ofstream  output("dragon.out");

    int d1,l1;
    int d2,l2;

    int time1, time2;

    input >> l2 >> d2;
    input >> l1 >> d1;

    time1 = l1/d2;
    time2 = l2/d1;
    if(l1%d2!=0) time1++;
    if(l2%d1!=0) time2++;

    if(time1<time2) output << "Justice" << endl;
    else output << "Failure" << endl;
}