#include<iostream>
using namespace std;
double h,r;
int main()
{
	int b=20000;
	int num=0;	
	cin>>h>>r;
	double n=3.14*(r*r)*h;
	while(1){
		b=b-n;
		num+=1;
		if(b<=0){
			break;
		}
	}
	cout<<num;
	return 0;
}