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#include<stdio.h>
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int main()
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{
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double k,l,s,w;
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while(scanf("%lf%lf%lf%lf",&k,&l,&s,&w),k||l||s||w)
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if(s<l||w*9.81*s-k*(s-l)*(s-l)/2>=0){
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if(2*9.81*s-(s>=l)*k*(s-l)*(s-l)/w<=100)
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puts("James Bond survives.");
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else
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puts("Killed by the impact.");
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}
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else
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puts(Stuck in
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