#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(){ double h,r,s,a; cin>>h>>r; s=(3.14*r)*(3.14*r)*h/(20*1000)+2; cout<<int(s); return 0; }