#include<stdio.h>
int main ()
{
int h,r;
double pi=3.14;
scanf("%d %d",&h,&r);
double v=pi*r*r*h/1000;
double n = 20/v;

if (n-int(n)>0){
	n=n+1;
}
printf("%d\n",int(n));
return 0;
}