#include<iostream> #include<cstdio> #include<bits/stdc++.h> using namespace std; int main() { double v,a; int h,r,c; cin>>h>>r; v=3.14159*r*r*h/1000; a=20/v; c=(int)v; if(a-c<0) { a=a+1; } cout<<(int)a; return 0; }