#include <iostream>
#include <cmath>
using namespace std;
int main()
{
int h,r;
cin>>h>>r;
cout<<ceil(20*1000/(3.14159*r*r*h))<<endl;
return 0;
}

#include<bits/stdc++.h>
#define db double
using namespace std;
const db pi=3.14159;
int main(){
    db h,r;cin>>h>>r;
    int cnt=0;
    db sum=0;
    while(sum<=20000){
        sum+=pi*r*r*h;
        cnt++;
    }
    printf("%d",cnt);
    return 0;
}