#include<bits/stdc++.h>
using namespace std;
const double Pi=3.14159;
int main()
{
int h,r,v,ans;
cin>>h>>r;
v=h*r*r*Pi;
if(2000%(int)v!=0)
ans=20000/(int)v+1;
else 
ans=2000/(int)v;
cout<<ans;
return 0;
}