zoj 1904 Beavergnaw

#include<stdio.h>
#include<math.h>
#define PI 3.1415926
int main()
{
	int d,v;
	while(scanf("%d%d",&d,&v) &&d&&v){
		printf("%.3lf\n",pow(d*d*d- 6*v/PI,1.0/3.0));
	}
	return 0;
}

盗图一张