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15 lines
249 B
C++
15 lines
249 B
C++
#include <stdio.h>
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#include <string.h>
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#include <stdlib.h>
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#include <math.h>
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#define PI 3.1415926
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int main()
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{
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int L;
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while((scanf("%d",&L)!=EOF)&&(L!=0))
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{
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printf("%.2lf\n",((L*L)/PI)/2.0);
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}
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return (0);
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}
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