#include<iostream>
#include <fstream>
using namespace std;
int main()
{
    freopen("dragon.in","r",stdin);
    freopen("dragon.out","w",stdout);
    int li,di,ld,dd;
    cin>>li>>di>>ld>>dd;
    while(li && ld)
    {
        li-=dd;
        ld-=di;
        if(li<1){
            cout<<"Failure\n";
            return 0;
        }
        if(ld<1 && li>0){
            cout<<"Justice\n";
            return 0;
        }
    }
}