Create 1441.cpp
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#include <cstdio>
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using namespace std;
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const double pi=3.1415926;
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double round;
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int main()
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{
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while(scanf("%lf",&round)==1)
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{
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double ans=4*pi*round*round*round/3;
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printf("%.3lf\n",ans);
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}
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return 0;
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}
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