#include <stdio.h>
#include <iostream>
int main()
{
    freopen("dragon.in", "r", stdin);
    freopen("dragon.out", "w", stdout);
    int di, dd, li, ld;
    std::cin >> li >> di >> ld >> dd;

    if(li / dd > ld / di)
        std::cout << "Justice\n";
    else
        std::cout << "Failure\n";
    return 0;
}