#include<iostream>
using namespace std;
int main(){
    int h,r;
    cin>>h>>r;
    int v;
    v=3.14*r*r*h;
    int n;
    if(20000%v==0)
    n=20000%v;
    else
    n=(20000/v)+1;
    cout<<n;
    return 0;
}