/*  This Code is Submitted by wywcgs for Problem 2105 on 2006-06-24 at 11:04:59 */ 
#include <cstdio>
#include <cmath>

const double G = 9.81;
const double SV = 10;
const double eps = 1e-3;

int main()
{
	double k, l, s, w;

	while(scanf("%lf %lf %lf %lf", &k, &l, &s, &w) != EOF && fabs(k) > eps) {
		double v;
		if(l-s > eps) v = 2*G*s;
		else v = 2*G*s-k*(s-l)*(s-l)/w;
		if(v < -eps) printf("Stuck in the air.\n");
		else if(sqrt(v)-SV < eps) printf("James Bond survives.\n");
		else printf("Killed by the impact.\n");
	}
	
	return 0;
}