#include<iostream> // cin\cout\endl #include<cstdio> //scanf()\printf() #include<cstring> // strcpy()\strcat()\strcmp()\strlen()\memset() #include<cmath> //sqrt()\pow()\abs()\ceil()\floor()\max()\min() using namespace std; int main(){ int h,r,a,x,n; double pi=3.14; cin>>h>>r; n=pi*r*r*h; x=20*10*10*10; a=x/n; if(x%n!=0){ a+=1; } cout<<a<<endl; return 0; }