#include <stdio.h>
#define pai 3.14
int main()
{
	int h,r,v,sum=0,N=20000;
	scanf("%d%d",&h,&r);
	v = pai*r*r*h;
	
	
	if (N%v==0) {
		sum = N/v;
	} else {
		sum = N/v +1;
	}
	
	
	printf("%d",sum);
	return 0;
}

哪里错了啊