#include<iostream>
#include<fstream>
using namespace std;
int main()
{
    ifstream infile;
    ofstream outfile;
    infile.open("dragon.in");
    outfile.open("dragon.out");
    int Di,Dd,Li,Ld;
    infile>>Li>>Di>>Ld>>Dd;
    while(true)
    {
        Li-=Dd;
        Ld-=Di;
        if(Ld<=0)
        {
            if(Li<=0)
            {
                outfile<<"Failure"<<endl;
                break;
            }
            else
            {
                outfile<<"Justice"<<endl;
                break;
            }
        }
    }
    return 0;
}