25 lines
562 B
C++
25 lines
562 B
C++
#include <cstdlib>
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#include <cmath>
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#include <iostream>
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double pi=3.1415926535897932;
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using namespace std;
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double MIN(double x,double y)
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{
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if(x-y>0) return y;
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else return x;
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}
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int main()
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{
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double x,y;
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while(scanf("%lf%lf",&x,&y)!=EOF)
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{
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if(x<1&&y<1) break;
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double x1=x*x*(y-x/pi)/(4*pi);
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double temp=MIN(y/(pi+1),x);
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double y1=pi*temp*temp*x/4;
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if(x1-y1>0) printf("%.3f\n",x1);
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else printf("%.3lf\n",y1);
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}
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return 0;
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}
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