#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,s; double pi,sum,num; cin>>h>>r; pi=3.14; sum=pi*r*r*h; num=20*10*10*10; s=num/sum; if(num/sum!=0){ s+=1; } cout<<s<<endl; return 0; }