11 lines
233 B
C++
11 lines
233 B
C++
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//http://acm.hdu.edu.cn/showproblem.php?pid=2002
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#include <cstdio>
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#define PI 3.1415927
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int main(int argc,char ** argv){
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double r;
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while(scanf("%lf",&r)!=EOF){
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printf("%.3f\n",4.0/3.0*r*r*r*PI);
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}
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return 0;
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}
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