#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; double A; cin>>h>>r; A=(3.14*r*r)*h; cout<<(int)(20/A*1000)+1; return 0; }