#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,a,std,b; cin>>h>>a; b=3.14*a*a*h; std=(20/b)+1; cout<<std; return 0; }