#include<bits/stdc++.h>
#define db double
using namespace std;
int main()
{
const double Pi=3.14159;
int a,h,r;
cin>>h>>r;
int cnt=0;
int sum=0;
while(sum<=20000)
{
sum+=Pi*r*r*h;
cnt++;
}
printf("%d",cnt);
return 0;
}

#include<iostream>
#include<cmath>
using namespace std;
const double PI=3.14159;
int main(){
int h,r;
cin >> h >> r;
cout<<ceil(20/(PI*r*r*h/1000));
return 0;
}