#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 z=0,h,r; double s,x=20*1000;; cin>>h>>r; s=3.14*r*r*h; while(x>0){ x=x-s; z++; } cout<<z<<endl; return 0; }