#include<cstdio>
#include<iostream>
using namespace std;
int r,h,n;
const float pi=3.14;
const int vt=20000;

int main()
{
	scanf("%d%d",&h,&r);
	long long v1=r*r*pi*h;
	if(vt%v1==0)
		n=vt/v1;
	else if(vt<=v1)
		n=1;
	else
		n=vt/v1+1;
	printf("%d\n",n);
	return 0;
}