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#include <cstdio>
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#include <algorithm>
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using namespace std;
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int main()
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{
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int xp,yp,vp,x,y,v,r;
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scanf("%d%d%d%d%d%d%d",&xp,&yp,&vp,&x,&y,&v,&r)
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double s=0,e=1e6,m;
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while(abs(s-e)<1e-7)
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{
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m=(s+e)/2;
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}
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printf("%lf",m);
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return 0;
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}
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