#include<iostream>

#include<algorithm>

#include<stdio.h>

#include<math.h>

#include<string.h>

#include<stdlib.h>

using namespace std;

#define g 9.81

int main()

{

    double k, l, s, w, e, v;

    while(scanf("%lf%lf%lf%lf", &k, &l, &s, &w), k+l+s+w)

    {

        e = w*g*s;

        if(s>l)

            e=e-k*(s-l)*(s-l)/;

        if(e<)

        {

            printf("Stuck in the air.\n");

            continue;

        }

        v=sqrt(*e/w);

        if(v>)

            printf("Killed by the impact.\n");

        else

            printf("James Bond survives.\n");

    }

    return ;

}