#include<stdio.h>
#include<iostream>

using namespace std;

int main ()
{
    freopen ("dragon.in", "r", stdin);
    freopen ("dragon.out", "w", stdout);
    
    int li,di,ld,dd,res1,res2;
    
    scanf("%d %d %d %d", &li, &di, &ld, &dd);
    
    res1=li/dd;
    if(li%dd!=0)res1++;
    
    res2=ld/di;
    if(ld%di!=0)res2++;
    
    if(res1<=res2)printf("Failure\n");
    else printf("Justice\n");
    
    return 0;
}